The way I built my last box was with 3,500 pound strength wood glue. Then I put L-brackets on all the walls of the enclosure. And the box was screwed together and all predrilled before the screws went in. All the screws were about 2" long. And the glue was pretty solid. I tested it by screwing two pieces of mdf together. When I took the screws out about 2 minutes later. I tried taking the two mdf pieces apart and I had to use a hammer. And the glue said it had to dry for 24 hours and it was really strong in 2 minutes. Box is pretty solid after everything.