Ha Jim,
I think like Griffs, you can build a Lightweight to HTP Fia paper spec. Most racing are like this I think. This one was built in the early 2000's (you can imagine how much it cost to build today with all the right bit!).

It was built for historic long distance endurance rallys but I think only did a few and only been actually raced once! It has rally cams and a bit lower CR that a top spec race one, but tis could easily be changed. I here good ones can make about 340 - 350bhp. This one has about 310. Really gets in to it stride over 4.5 - 6 and a bit (could not be revv'ed out at GW in third as said dure to the boise limiters - but cracking fun). Even these recreated cars go for 100 - 250ish K!!!
We got Marcus Pye out in it for one of the later runs in the day.
Guaging thewidth of the thing first time out was interesting clouting the tyres at the chicane (just a big paint scuff, no bent panels, but felt like more - haha).
Enties in for Le Mans (make a nice weekend on the shandies!) and we were chatting to Marcus on the propose Lightweight races series in Autosport a few weeks back (can't see that having legs - but if it does, he'll be having a go

)

- Nice Arse.
Weird the whole pics did not come out - likely too big.
http://www.blip.tv/file/3308576