Proper air jacks aren't cheap and you have to have a big nitrogen cylinder with you at the track to hook the car too. Are you planning on running races that will require the speed of lifting that air jacks offer or you just want something that lifts the car?
Not planning to do any "NASCAR Style" pit stops, just kinda thinking that if I have a front splitter, side pods (likely fiberglass) and a rear diffuser, that doesn't leave any obvious places to slide a jack under the car. Plus, the car is going to be kinda low to the ground, making it more difficult to get a jack under it.
I was thinking that a fairly flat "air cylinder" (as Ted put it) could slide under the low clearance, be easy to push under the sidepods to the frame, then open a valve and raise the car. As you point out, the problem is having either a compressor or a big bottle for supply.
The "Titan" style air jack might work, but it looks like it's kinda slow, like 2 to 3 minutes to raise the car using exhaust. (Might be faster with compressed gas, but that leads to the supply problems like the other air jack.
I might look into the "Titan" style a bit more. Found one earlier tonight called "Bush Ranger" or something, looked very similar, bigger, and more expensive. It's more to lift your stuck 4X4 out of the sand as opposed to changing tires on your Honda. Overkill for a Locost.
I also will look into the leads that Ted gave us, air cylinders and such. Perhaps there's another method in there somewhere.
Hmmmmm..... Mostly just thinking out loud. Stay tuned!