I'd have to see the pictures, but if it's just a built up G&P kit and Mauri Thompson, buy them yourself and build it yourself, it's actually an easy conversion.
tain669,
I have the TM airsoft and the G&P conversion kit that I never got around to building. If you can do the assembly yourself I could sell you my stuff. Or if you can wait a while, I could assemble it for you.