Cheers Wil..
Appreciate the input.
Have been looking for FLAT glass side window regulators.. went the entire way through the Dorman catalogue.. 1000+ entries.
Found the early Hyundai Getz, Ford Focus (00-07) and Hummer H2 (03-09). All have flat side glass, the smallest of which is the H2 with a window opening of around 350mm (scaled from a dimensioned drawing), the other two are close to 400mm. The Suzuki Vitara is larger again, but a cheap and relatively easily modified regulator.
These regs would need to cut down by 50mm or more and the cable re-swaged with a fitting, but there is almost NO lost space between the bottom of the glass clamp and the regulator which is whats required to fit inside the standard Coupe doors and fully retract the glass.
In speaking with a pro in the field this afternoon, he suggested a Ford Capri (roof that leaks anyone.. !!). These are similar to the units mentioned above, but are 3x the price for a reco unit.
Cheers
Chris