Graeme, sounds like you are well on the way.
I would also contact the large interstate Cobra assemblers just to get a comparison. Air fares are cheap these days to pop in and see the progress. I expect most will email you photos of the progress as well.
Doug Pearce Engineering(VIC) is someone I would definitely speak to. Independent of a manufacturer and his built many, many Cobras.
In QLD, we only have the manufacturers themselves that I can recommend to build your Cobra - Harrison & DRB.
For the sort of money you will be spending I would be shopping around as I think you will be surprised how good the options get if you look further afield.
Hmm, Corvette, very nice.
We've had guys up here buy something like that to enjoy while their Cobra is being built. We've also had guys buy 2nd hand Cobras to drive around in while waiting for their own car to be built.