Weld Talk Message Board and Online Forum - Hobart Welders
Try these guys. Ask around on there and see what they might have to offer, also weldingweb. I think you are going to find that the amount of complication and pricey components will make it more than you want to deal with. Theres guys out there who can fab this stuff but folks like us usually don't fare too well with the complicated stuff. You might also be interested in setting up a scratch start tig rig. That does away with the fancy foot pedal but still allows enough control to do the deed well and without most of the complication. I do know they were discussing that on the hobart forum last year. The pros didn't seem too impressed but then they have an entirely different standard to uphold and a lot more cash to play with having write offs and such.
One other thing to consider and laugh all you like. If you aren't doing a lot of it and it's not going to kill someone if it fails try some of that magic aluminum weld rod from HF or Magic Misslie Rod if you can find it at the LWS. It's just a braze using a propane torch but I have used it in the past to fix some gnarly aluminum problems and it is stupid simple to use and very very strong. I fixed a wollowed out retainer hole on my Cessna's cowling inspection hatch years back. I got it a bit off center and ended up with the stainless screw rubbing on one side solidly. 2oo flight hours later it was solid and unchanged after being subjected to that shaky old Continental 4 banger. It's strong, just don't tell anyone you use it or they will laugh at you and make jokes.