Yes, I could. But I would much rather just get two ported tens then go through having to build the box inside the trunk to get ported 12s.
Use cardboard or project board to find the largest dimensions you can fit into the trunk opening, and we'll go from there
Feel free to PM me with questions.
System Layout help available via PM.
Just buy a prefab one off of ebay for like $110(plenty to pick from) then get some old-school round Kicker Solo-Barics and a Kicker zx750.1 if you're gonna stick with a sealed box design. Mustangs are suppose to be good at getting loud.
mustang items - Get great deals on Custom-Fit Boxes, Triple or Larger Boxes items on eBay.com!
Sold to: Mills561, Kross6622, sleazebagger, shpatb, esmokah
Bought from: DJ Nitrous 427, 97maxima