Started my build with birtch ply wood,I use mdf for the most part and im tring some new stuff on this build. Like a 18''sub,crown staples,silicone. So far so good just a little choppy. Here are some pictures of the start. Will finish as soon as my 1-1/2 roundover router bit makes it to me. While im waiting ill start welding the battery box amp rack combo bracket.