Wow ang laki! Very nice...congrats!
Comment lang, why two doors for ht room? The door at the front might affect your speaker placement. Also it might affect your traps placement for first reflection.
You might want to check also the width, 12 ft. Pag nakabit na lahat ng sound proofing mo, bka lumiit na yung clear distance mo. Sa lenght ok naman sya.
Just a thought....