Well, this thread and N2's page have helped me greatly. I am almost done with the box and will be posting pics soon. But I have 2 remaining questions.

1. The box is 3/8" thick minimum for FG should I bring this up to 1/2", 5/8", or is it not worth it and leave it as is?

2. When bolting into the floor, should I tap the holes and bolt direct into the body/floor or should I drill and just use lock nut and bolt?