I'll chime in on this one.
I personally enjoy the Shelby 'clones' only I prefer the term 'replica'. I use the 'clone' term on poorly done imitation's that barely manage to get the stripes proper and leave it at that.
I've been building a Guardsman Blue '65 GT350R model Mark Donohue 'replica' for about 5 years. I received it as a nice original Springtime Yellow non-GT A-code automatic. I've had the car 10 years and have been collecting the original Shelby parts just as long, as it's always been my goal. When it's done, it'll be worth almost twice what it would be if it were left stock.
It'll be done in late 2007 for it's debut at the '08 Silver Springs show. I've used mostly original Shelby parts and repo's only as necessary. My final decision is R-model plexi-glas door and back windows or stay with original glass. It'll probably be plastic as everything else is pretty correct. I've even got the original 'Bed of snakes' alternate headers that actually came on 5R535 as one of my finishing touches.
A local friend has 5R534 and verified their authenticity as his car has the same ones and they're vin stamped. These were the last two R-cars built and came with the optional headers instead of the standard tri-y's.
I've learned a lot and met a bunch of great folks along the way. I'm also pretty good friends with the guys over at Holman-Moody now as a result - they did my cams for both the K-car and my R-car.
My car will never be real but if Mark Donohue was still with us, I'd bet he wouldn't turn down a hot lap at Watkins Glen, VIR or Road Atlanta.....
Preserve the hobby. If you can't afford the real deal then build the next best thing - a 'Replica' !!!
Mark
ps - my '66K has the window sticker, build sheets and owner warranty card........