It looks like you missed the first paragraph of my reply, so I'll repeat it:
Please read the forum rules for posting (click here). You seem to be missing a couple of things! 
From the above quote (hope it worked) you mentioned that you have shown people how to do this before? I am pretty determined to make this modular studio, could you potentially take me through one of these? I understand if it is a proprietary design and you can't share it, but if not, I would really appreciate the guidance!
The basic concept is simple: Design the studio exactly as it would be for a permanent build, including the needed isolation, the correct treatment, the HVAC system, etc. Then modify the walls and ceiling such that they can be built in sections just a meter or two wide, with mating surfaces that can be bolted together with suitable seals between them. Then do the same process for the treatment: design it such that it is not permanently attached to the walls/floor/ceiling, perhaps as modules that hang on the wall for lighter weight devices, or sit on the floor for heavier devices but with attachment points higher up to prevent them tipping over if they are top-heavy. The HVAC system is usually "modular" in any case, as each silencer box is fairly independent, so that doesn't need too much extra design work to make it "portable". And the same would apply to furniture: make the desk modular, perhaps with modular rack inserts if you have a lot of outboard gear, such that the modules can be separate from each other. The final step would be to make sure that the individual parts, panels, devices, and modules are strengthened structurally, such that they won't fall apart or suffer too much damage when the studio is disassembled and moved. Some damage is inevitable, so some re-building will be needed at the final destination, but with good design, that can be minimized. For example, rather than using the typical two layers of 16mm drywall on each leaf, I would use one layer of 19mm OSB plus one layer of 16mm drywall instead, with a layer of Green Glue in between, for both the excellent acoustics properties it provides as well as the seal that it provides (but obviously not at all for it's adhesive properties, since it is not adhesive!). I would also use a combination of screws and nails for the OSB layer, with a schedule of more fasteners than is required by code, on both layers.
It would be a challenge, but it is feasible. I'm working on a mastering studio for a customer in North Carolina right now where I am implementing some of these concepts, but not completely, as the owner isn't certain that he'll need to move it, and doesn't want to invest all that extra money in something that he might not ever need to use. He prefers to invest that extra money at the time of the move, if it ever happens, since that would be expensive anyway, and would also involve some reconstruction and repair of damage anyway, regardless of how it is built now.
If you wanted a full design for such a studio, then I could do that for you, but it would have to be a paid project. It's just way too much work to do, and not what the forum is meant for at all. The forum is meant to be a place to get help with specific issues for people who have the basic knowledge and skills needed to design and build their places, but perhaps not in all the detail needed. It's not meant to be a place where people can get a full, complicated studio design for free! I'm pretty sure that wasn't your intention at all, but I'm putting it out there anyway, just to avoid misunderstandings. If you wanted to hire someone to design this place for you, then first contact John Sayers himself, and if he is unable to do that (he's a busy guy!) then PM me, and we can talk.
On the other hand, if you wanted to learn how to design/build it yourself, with the normal free assistance that everyone gets on the forum, then I'd suggest the you read two books: "Master Handbook of Acoustics" by F. Alton Everest (that's sort of the Bible for acoustics), and "Home Recording Studio: Build it Like the Pros", by Rod Gervais. The first one will give you the basics of acoustical theory and practical implementation of acoustic design, and the second one will help you put that into reality in the actual design and construction of the studio. The second one is more of a "nuts and bolts" type book, about how to do many the calculations that you'll need to do, how to design the structure, how to design the doors and windows, how to calculate and design the HVAC system, how to do the framing, how to seal things, etc. The first book is more about the theory behind all of that: the reasons why things have to be done in one way instead of another. Together, they'll give you all the basics that you need to get started on your design. Realistically, it takes about three to six months to learn enough to be able to do the complete design, and another two to four months to actually do it. Then you can start on the actual construction, and that could take anywhere from a couple of months to a couple of years, depending on how you approach it: it can be done faster if you hire an experienced contractor to build it for you, but that will cost a lot. Or you can save a pile of money by doing most of the work yourself, but the build will go a lot slower. There are some parts of the build where you will absolutely have to hire professional people (for legal reasons, as well as for safety and just plain common sense!), such as for the electrical installation, structural calculations, and HVAC, for example, but most of the rest you can do yourself.
Here are two other options for a "portable studio" that you might want to think about:
http://johnlsayers.com/Pages/Spark_1.htm
http://www.johnlsayers.com/phpBB2/viewt ... 25&p=30206
Those are really good potions if you need a studio that can be moved from place to place.
By the way, you are not the first one to go down this path!
http://www.johnlsayers.com/phpBB2/viewt ... 1&p=134028
That one ended the way most such threads do...
Here's another link to a thread about portable studios, that also went the way most such threads go:
http://www.johnlsayers.com/phpBB2/viewt ... 3&p=131484
This one too...
http://www.johnlsayers.com/phpBB2/viewt ... 6&p=137632
I'm really, REALLY hoping that you'll be the first to actually do this!
- Stuart -