I know several people have looked into having the tri-z clutch cover reproduced over the years, but nothing has made it to market yet. I've been talking it over with the manager at the machine shop I work at, and I have a green light to begin drawing up a solid cad model on my own time(after hours). As soon as I can bribe our Q.C. guy to stay late for a little bit, I'll throw a good cover on the C.M.M. and beep in all the bolt and dowel locations, along with all major features and the the gasket surface profile.
I'll be making these out of T6 or T7 billet aluminum. There will be quite a few revisions to the cover. I should be able to thicken all of the walls and increase all internal corner radii for strength. I personally hate the oil check bolt, so I'll likely install a sight glass from a master cylinder in it instead. To help eliminate extra set-ups and machine time, I won't be putting in any provisions for a powervalve(sorry guys).
With the arrangement I have with my employer, I would be buying all material myself and pay the shop for machine time. I would have to do all machine work on my own time, and when there is a machine open/available. With all that said, I hope to be able to buy the material needed for fixture plates and a half dozen or so covers by spring. Unless complications pop up, the price for these covers would be $300.
It will take a while before I have any finished parts. After 1 or 2 are made and I have a chance to streamline my program, I should be able to make around a dozen or so a month. I just wanted to give the tri-z crowd a heads up.