So, after a lot of looking for material price and machining cost I think it will cost too much to make these. I've looked into 3d printing and had one hand made. I like what I see. Having the other hand made, should have it in a day or two. Going to install this week to hear how they sound and make sure install goes smooth. looking like I should be able to get these made and sell for $150 a pair plus shipping. These are made to fit Kicker CWRT67 subs, may fit others. They take about 13hrs. each to make on the printer. I will need a couple days to make each pair. If everything works, I will try to make some for 8" subs. Here are pictures of the first hand before installation.