quick advice for a tight budget..Brand new room in Novato

Hello there everyone. I would like to say firstly that I am very encouraged to find such a helpful and thoroughly informative site. Even more-so to learn that it is operated for free and with such kindness. I have an urgent question for anyone capable and willing to answer. I have recently moved into a warehouse in Novato California. I plan to complete the construction of my project studio THIS WEEK. It will be just one room. (i work alone usually and will not be recording live bands) Although the warehouse is very large (1600 sq. ft.), My studio is built much smaller and rests within it on one end of the facility. The room has already been framed but is not yet insulated OR sheetrocked. The dimensions are: 10' tall / 14' wide / 15 1/2' deep This week I intend to install two layers of 5/8" sheetrock to the interior and a single layer on the exterior. Before I go at it, I want to determine if I should do any more framing. I don't want to have regret later that I did not frame the walls differently. Here are my concerns: * RATIO Should I be worried that the room is too "square" and therefore build another wall, shortening the width? this would bring me to the desired 1 X 1.28 X 1.54 ratio. * Parallel walls Is it preferable for me to frame 2 more identical walls angled at least 6 degrees to each side to be sheetrocked or would it be better to build slat absorbers AFTER I sheetrock. Thank you in advance for helping! I am in a big hurry to setup and finish mixing an album. (note: I have about 6 free standing broadband absorbers that I intend to place within this room along with whatever else is needed) Blake

Speed kills.

i'd build it with rectangular walls (if you can, extend the length to 19 feet)(or maybe add a wall to shorten the side to get the better room ratio and use the space behind it as bass trapping and/or storage) and then build up the treatments with your panels and maybe some panel traps or slat resonators to correct any major modes.