I understand both sides tbh, I'm sure Brad would do a very good job, but if something goes wrong, as it invariably does at some point, he doesn't have the insurances to deal with such a problem. And the fact that you've been recommended a bloke who does it on his drive, that you've never met, by people that you've never met, over the tinterweb, would certainly not fill me with confidence. Bear in mind that Brad has done a few conversions now, but I certainly wouldn't class him as an expert either. No offence to anyone intended. 
No I'm not a expert but who is ? Some guy you have never met who works in a garage ?
Quality of our work speaks for itself at more than competitive prices
And as for insurance, no I can't offer that at the moment but if said customer wanted to supply his own parts then I would happily fit it all using OEM looms, ECU and Mount points
At the end of the day it's up to him. But paying more wont get u a better job.. That's why I started doing this
I like things to be perfect and my idea of perfection is very different to many company's
Also worth mentioning not to listen to idiots who hate for no reason on here ( not aimed at you )
:-)