Shot's studio - layout&construction question

Hi all! Here's my situation. I've rented a basement in a old building, in a center of town (Zagreb,Croatia). Built in 1940's, it's typical mid-east european architecture style with walls ranging from 30 to 60 cm thicknes (outside walls carry the construction and are almost 80cm thick - great for sound isolation!). Basement area is around 70m2. Since I'm renting it, it makes no sense bringing down existing walls and that probably wouldn't be acceptable for the owner who I'm renting it from. But, I find the current wall setup very acceptable. I plan to add two more walls and undertake some of gypsum-board over-the-wall isolation work. I have a specific question concerning control room, but I'm writing this so you can understand it in a bigger picture. Last image on the bottom of this post is the current layout of the entire basement. I like the fact that I can have separated drums and amps when recording. It could gain me some one-day sessions, doing demos for bands. Ceiling height is around 2.70m. Ceiling is rounded and very thick so it could save me some money. I don't have to build a floated ceiling, I'll just build some hanging absorbers on specific spots. But, as I've said, my current hadache is the layout of the control room. Control room has a weird dimensions. It's 3.35 meters wide and exactly 6 meters long. Check the layout of the control room (fourth image on the end of this post) My problem is the length and the positon of the door. Door is in the back of the mix position, exacly where a lot of sound absorption should occur. Also, in one corner of the room, near the door, is the gas meter unit. It should stay where it is now. Also, on the opposite side of the room there's a gas switch (sorry, I don't know the exact english word for it). That isn't problem - I'll hide it in a wooden box with a door so it won't be visible but still accessible. Third image on the end of this post is the layout with marked gas switch (red) and meters (yellow): And gas meters (second image on the end of this post): I've thought about this problem and I find the only solution to build some angled gypsum board walls (they may even contain closet) (green), and on the outside of this walls build an absorber throughout entire outside surface (blue). I could have access through the closet to the gas meters. (Check the first image on the end of this post) But what about the door? It would be impossible to open it if there was 10 cm of rockwool on it! On the other hand, 2 cm of sponge would be useless for low frequencies. Help me out! Any suggestions? Sorry for my english. I'm not native english speaker. Also, sorry for posting images at the end of this post. My forum skills are so-so... I couldn't manage to put them inside the text without having them posted twice (in the text and again on the bottom). :oops: :)

What if you forgot about accessing the control room from the rear and tried a layout like this? cheers john

or you could do something like this cheers john

Huh! Interesting! I'll give it a thought! Need few days to think about it! :)