so, here is a quick rundown of the sub enclosure and single-amp rack.
built the frame and started glassing:

after all the glass, filled with 12oz of polyfil, built the amp rack put the top on it:

test-fit before carpet, paint and port:

with carpet - before port (the sub hole looks all wonky because I quick-cut the carpet instead of using a razor to make it clean, but the sub-hole is actually router-round)

pick of the top with the amp mounted - I still needed to clean up the quick scissor cuts of the carpet, they look clean and straight now:

another view

with the sub in, I cant find my port flare (the port trim piece that makes the port look clean and tidy, but I will get a new one if I cant find it)

What I didnt show was the mounting feet/tabs on the box, bolted through the floor with security screws or the security screws holding down the sub and the amp...
more to come as it happens...