As a matter of pure truth there is not one thing that can be said that cannot be altered in some other fashion to achieve the same goal.
This is most often refered to as "compromise" but can go under several names depending on who it is that is saying the thing.
Given the dimensions of the room and an explanation of what is in this room at the moment we can explain where you are in the frequency spectrum, what the trouble spots are going to be and what you would need to do in order to overcome these issues with simple math.
"Master Handbook of Acoustics" the Author uses "5%" as a method of canting/angling walls to add modest diffusion, remove flutter echo while not removing modal issues at least pushing the frequency issues down. So there is yet another determination of what can be down in respect to wall angles, although we consider the Author, Mr. Everest, as the expert.
Room ratios, simply another stumbling block on the road to sonic Nirvana in the mind of the over-instructed. They simply do not matter as much as one thinks since it is like the glue that holds the frame together. The glue is important but the entire "picture" has to be considered or you just have a bag full of parts with no sonic experience or visual appeal.
If this is a do it yourself project...you have to continue to get educated in the other trades persons craft as much as you are willing to actually hands on do. But talking to those educated as said trades persons cannot go without saying. Reading about a thing and DOING the same thing can produce completely different results if you are not experienced in a multitude of crafts and have thought the design aspect of the project out to the last nail.
You would not expect to build your home without a well thought out/proven plan would you? You would want to know the final cost as near as possible in advance would you not?
This is where confidence comes from. Because you will need confidence of a clear project path, design and costs in order to make even the smallest step or you start to DOUBT, and doubt never comes to any good.
So as I see it you can produce a "
ModifiedLiveEnd/ModifiedDeadEnd" which would allow you the convenience of having a mixing/control area at one end and a tracking area at the other end. If done correctly you would have wall mounted and or stand mounted hard-faced reflective and the reverse side would be soft-backed absorbing to assist in the tuning of the room given the desired use for the room at the time.
The entire room could be used as a tracking room while recording if you think out ever little thing. Like the computer box. It needs to be OUT of the mic path but NOT bound up so much that it is difficult to access or runs the potential to overheat. But fan noise has to be removed not stuck in a corner. Because as we have learned, sticking things in the corner increases the loudness of said thing by as much as 6dB.
So the limits to what can or cannot be achieved that some have presented in this thread are the limits of the one that posted. There are no limits. There is how much physical space the user has and how much money the user is willing to throw at his or her project.
Everything else is compromise. Everything.
From the choice of do I continue to educate myself or do I hire a designer? Do I install the main framing or do I sub it out? Do I use damping compound (green glue) on my ceiling/wall assembly panels or do I add another layer of mass instead and live with the not as low frequency transmission loss?
Compromise, it's not a bad word, it is another tool for your toolbag.