Anyway, went to a local plastics supply company (Regal Plastics, for those in Austin area) and they don't stock kydex but the lady gave me three 8x14 inch samples of 060 thickness ABS plastic sheet. She said it's very similar to Kydex. Some internet reading shows it is certainly cheaper, but not quite as strong or durable as kydex. Still, thought the practice couldn't hurt and who knows maybe it will hold up.
Then went to local Tandy Leather store and bought some cowhide shoulder and a few odds-n-ends. Then a trip to Ace hardware for some fasteners etc.
So here's my first holster, for a Kahr K9 I picked up in trade last week:

Trying different options to mount the plastic shell to the leather backing. May just go with rivets now that I found some at Hobby Lobby. The clips are Comp Tac 1.75-inch that I had laying around. I tried making my own clips from the 060 ABS plastic but the material is just too thin and weak for clips (measured Comp Tac & Tucker plastic clips I have and both measure .125 thickness - so need to order some thicker kydex to make clips).
After that, decided to try to make an OWB holster for my Smith & Wesson K-frame that I plan to use for IDPA revolver (SSR) shooting next month. Working with kydex only is more challenging (making the two halves of the holster fit just right, bending the shape just right, etc). I also did the mold/press incorrectly for this one so ended up molding the shape by hand with a heat gun and gloves. Very tedious and time-consuming, lots of trial and error. The basic idea was to merge the styles of Comp Tac's OWB holster (folding over plastic from top to form belt loops) but with a wider, pancake-style design like Raven Concealment holsters. It fits well and after a lot of adjustment retention is just about right. Belt loops are still problematic - again the 060 thickness plastic isn't ideal for belt clips/loops, and the shape of the gun and curve of the holster make threading a belt through a chore, but I think I have a servicable holster for IDPA. Still some finishing work to do with a few more rivets, etc.

Early version above, before cutting.

Closer to finished shape

Backside showing integral belt loops
...
Anyway, good learning experience. Will likely order some actual Kydex from knifekits.com and try a few others. Tips, suggestions, critiques welcome of course.
