^ this!
ive done a few box builds on the side and installs and honestly i hate working on other cars besides mine, mainly for the fact that i know how to work on my car, and if anything breaks its my fault on my truck
on of the boxes i built for my buddys truck ended up being to big but my other friend thought he could force it in
i said i have nothing to do with this but the guy let him, and by the end of it the box didnt fit and the trunk wouldnt close
i gave him his money back and he left, the the trunk not closing was not my fault