From other forth order builds I've seen and the amount of power your adding I would double up the plywood, or even triple it up. And also I would water prof all the wood with water seal and also fiberglass it.
that great looking build and your gonna run those? ****, well I guess you did mean only 2k total. But hey, to each his own. Its a great looking build so far
Cool layout man, how much does that thing weigh? Would love to see a nice plexi window on the top in the shape of a triangle. Would look sick. What are the plans for finishing the box? Carpet, paint?