It is made from 6mm ABS Matt black plastic instead of plywood, it should last a lot longer and wont suffer from stone chips.
Its fixed on with 8 x M6 bolts and 32mm washers to spread the load when tight.
some crap last minute pictures-


I am dubious about any perfromance gains but it looks the dogs danglies.
I'd like to make some for the S1/S2 elise for the general market if someone wants to donate a car for templating? Il make one at cost for them.
