I forgot to add this link to my previous post.
http://www.the-ace.org.uk/rebodying-...tion/#more-150
As for the cost, no matter how 'careful' you are, cost will escalate. I have built two cars in the last 5 years, the first, a Marlin Roadster, cost me over £2,200 to build and my current build has passed that by a margin although that includes the purchase of the original car, I had the Roadster given. Both cars have been built from bits and pieces, minimal new parts, the paintwork has been brushed or rolled. The only bit of 'bling' has been a few stainless fasteners from Screw-Fix. I even re-used the engine bearings and rings.
The satisfaction factor of creating your own body panels is amazing, no matter what material they are made from. I try to make as much as I can myself.