Hi Jas,
have you made the rear of your chassis as per book? if you have then you need to remove the round tubes of the rear frame & put in a "new" lower spar,
there is a thread discussing how i did mine in the bodywork section, ( sorry don,t know how to do a linky)
also you need to cut the grp to follow the shape of SB1 / CP5 / D11, look at my thread "Big Day" for photos of the rear tub area to explain what i mean
cheers
andy
remember measure a zillion times.....cut once
