Here's HAndy's measurments that worked fine for me...
long rear box tube = 99cm
the 2 spars from RS14 to the 99cm tube = 17.6cm, set at 5 degree,s upwards.
the 99cm tube is an odd dimension which is to allow the inner radius curve of the grp tub.
Got any piccies yet?
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My Build Diary -
http://davesroadster.blogspot.com/
*updated 7/6/11*
Best bit so far: Getting it running
Worst bit so far: Cutting steel for wishbones and engine mounts.
Most annoying bit so far: Generator packing up half way through welding.