are you just wanting to reinforce the inside of the box for stiffness? if thats the case many people just resin the walls and some may even lay fiberglass in the corners
it really depends on the equipment you have and the end goals you are trying to reach, but as stated above, most times ported will result in being louder
this seems like a good idea. but if someone simply went to the dc section, they would see who says "pmd" or "pm coming", and should be able to figure out thats who they should ask, its not that hard