Firstly welcome here, another Lola fan here is great.
See here for one amature approach, if you do not have access to 3d scanning technology.
CANAMSA - SA stratch build
If you are trying to save the expense of buying a model, you may as well give up now. I have over 10 times the cost of the model in the plug materials alone so far, even with getting the foam FREE and the plywood at recycled material costs. And the expense of the GRP materials still to come
Not trying to be rude, just stating my experience
Cheers
Fred W B