I'm sure it's a combination of all these factors.
@Scoota - I'm interested in the roof if between the time I'm next in Melbourne and your next project you haven't already used it. But don't wait on me, I'll find another if I have to or just wheel up my own patch panel.
I agree though, nothing ventured, nothing gained. Someone has to give it a go and try and perhaps fail so we all know what is and isn't possible. We can't just rely on someone else to do it first before giving it a go. Of course it helps, but the cost of a 2+2 roof skin will be a fraction of a 2 seater roof I'd think. So worth a punt!