Dan,
Do recall selling you some rails. Hope they are working out for you! See you shared photos of those most excellent rails.
Your doing so probably helped me out a bunch. Thank you!!!
For aluminum frame materials I went local dealer through one of the machine shops I do business with. Some of the material I already had. For the first machine anyway. No sense pitching the good stuff I'll only have to hunt up later. Coldfusion posted a note where a ebay seller has some stock for sale. I was thinking of getting some stuff from them but got no return answer to a note I sent. Probably a glitch. If you have a scrap yard local to you go browse what they may have. Always worth a peak on a regular basis. Did I mention that is my best advice out of any advice I might have to offer which ain't much?
Mike