Sorry, I definitely should have clarified.
I have pretty extensive woodworking experience and quite the vast selection of tools (table saws to CNC milling machines, and everything in between). For my highschool senior project a few years back, I built a speargun - a good test of precision woodworking, when you're dealing with routing shaft tracks and mounting things such as trigger mechanisms and line releases. Building the enclosure should not be an issue at all... woodworking I can do, but my speaker design knowledge is much more limited. My apologies for not mentioning this earlier, as I can see why many people probably come on here without first considering the tool purchases they might need to make.
Good to know about the ply. I didn't know if people special ordered (or visited "real" lumber yards) higher grade plywood.
About the drivers, why don't you like them? I am more than willing to listen to alternative suggestions. My only thought process was that the old Infinity Kappa Perfect design has been recommended many times on this site, and while they are largely unavailable, this seemed like a worthy alternative. I liked the dual-opposed design due to the high potential output for the footprint.
I'm looking for a sub that will pressurize a big room, size is not an issue (I'm willing to use 15+" drivers) and under $500 (including amp) in materials. Tool costs need not be factored in, as I have access to anything I would need (excluding VERY specialized bits, but I can't think of many I don't have access to, including dovetails etc)
Thanks!