TR.Remix,... I don't know where you got your info,.. but it is wrong,...... cabinets WILL sound good with Greenbacks and a marshall tube pusher,.....
and the boxes do not have to be factory produced to be any good....
anyone with some common sense, and a bit of skill with tools can build a great cabinet,...... I have a box from the 60s that was home made,... and it is every bit as good as anything you can buy that has a 'BRAND' name on it.....It is a but joints with corner blocks, glued and screwed,... and covered with the same tolex Fender uses...
Vintage 30 12" speaker,... and it sounds great......
Tyler, do not be afraid to do it yourself.......
If you are carefull, you can build several,... improving with each as your skills improve, and just use the same speaker,... just change it out to the new box,......and you will enjoy the self satisfaction of having a box you built yourself.......
ask for any more info,... there are several places to get more if you need it,....
Steve