John
firstly let me say thank you for your feedback on this, it is most appreciated.
I am impressed by your plan.....
I have a couple of questions....if you dont mind.
Firstly, by going with that plan, the construction gets a bit more complicated than what i originally had in mind.
My original idea was to just build the tracking room, knock a hole in the existing wall between the new tracking room and existing control room, for a door lock and window.
Thinking being, if we ever move from here, i simply knock out that door and window and the whole thing becomes a L shaped rumpus room...

or the real estate agent could advertise it as a home cinema room due to the acoustic treatment...
So i was thinking by building the tracking room with non parallel walls as per my original post, that might take care of A: containing a live drummer to the outside world due to having a solid brick wall on all four sides, and B: taming any acoustic probs that the room might have, via using your slot resonator wall designs.
I am not particularly unhappy with my existing control room sound, though i would bet London to a brick, that if i built your design i would probably love it.
where you have booth 1 on the diagram, is where i would ideally like to put the drums. Because that is the most solid part of the construction, and most likely to contain the noise. Is it possible to get a similar layout to your design, with the larger studio area where the iso booth is now? That would really make me consider going that way.
Also with regard to my original design, is that kind of tracking room design, feasible

Where i build the angled walls?
The green door in the Room A, (control room), on the second diagram i posted, goes to a lounge family room, that can be utilised as another tracking space if required, actually at present thats where drums are tracked. So it would be nice to get some distance between the drums and that room.
So i guess to summarise,
is building the tracking room as i orignally posted it, a useless idea, and
is it possible given the rooms, on your plan, to move iso booth 1 to where studio is and vice versa
thanks mate
Peter