The stryke has entered the building. Holy cow, if you ever needed inspiration for a project, this thing is it! No one has even slightly exaggerated the build of this thing!!! I am planning a modified version of John's cabinet that has grill cover for all drivers. It will still be 1.5" thick but I seek a lighter product than mdf. I would like to be able to heft the cabinet easily with no drivers installed. Home depot has a fir plywood that is 23/32" thick, with few voids except at the exact half-length point, where the voids line up all the way down the stack. This seems like a decent lightweight wood for a cabinet that has double walls. The majority of the voids could be easily avoided because of their location. Anyone tried this wood? Also the outside could be finished directly, although not exotic, it would look good stained black or painted. I don't think the 20lbs removed will matter at all.. the drivers are said to weigh over 120lbs alone ( i'm using the pr-18's with the he15) Another option is to use oak ply with the fir as the inner layer, but the oak has more irregular voids... I'm trying to avoid the expense of marine ply, as it would be 150+usd versus 60usd for the fir. Comments anyone?