Boomin_tahoe
5,000+ posts
Hurtin' feelings errrday.
Are you kidding? Working on a design right now for one for my X 15's...Yea HD sells 2ft sections of pipe. 2 part epoxy glue is good to use to glue the pvc to mdf, I also run a bead of Alex Plus caulk around all of the inside seams.
No the port ends don't need to be secured but depending on how you do it can help with the rigidity of the box. I usually try to incorporate a piece of the bracing to support part of the port tube.
edit:
T-lines aren't ideal for every sub. You want one with QTS below .4 and QMS below 7