Stop...
Give suggestions for his pwx box. Instead of saying they are junk. Never said they were junk. If you know ANYTHING about audio then you know there is absolutely NO FUCKING way to give a suggestion that is worth a shit without parameters.
What I have been strongly hinting at however is that he is going about an installation that will give him a ton of benefits. One that takes time, planning, and money to put together. Wasting that on ANY driver that isn't optimized for the install is stupid. As in really fucking stupid. It is also rather factual that most likely the PWX's are far from optimized for what he is doing. It would cost more money to pay someone to measure them or to buy the gear to measure himself than it would to replace them with something more appropriate for his needs and install.
My recommendation is very clear in this regard. I like his goals and attempts to reach them. Makes sense almost completely except of course the current driver selection since they are completely unknown and come from a company that most definitely made compromises that will adversely affect their performance in his install. This is absolute audio 101. Can't get around that at all.
Not quite sure why you'd find that confusing. Perhaps an analogy. Guy comes onto board. Has 1cuft of space and wants to design a box for an 18" sub. Should you "help him" design a box or point out perhaps that it won't work. This situation ends exactly the same of course with the caveat that potentially the driver wasn't designed as expected, but the possibility of that is VERY small.