Well I've invested a substantial 8 hours into the box for my 4 15" Maw's, taking my time doing everything, and making sure everything is good and strong. Here is some pics of the monster, its 90% done, carpeting and glueing the last piece on tomorrow...
Went with 3/4" MDF, 7.5" Sonotube ports, and I have 2 of the 4 15"s in my possession...