well ive just spoke to nick whos making the kit.
I need to leave the wings on as apparently it will be a lot easier to fit the kit if I use some of the original wings.

ive been searching for tyres i can run 295/35/18 rears at 26.1"
i can get a 265/35/16 fronts which are 23.3"
however i do it i must gain 2" total tyre size front to back, i will get nearer 3"

EDIT 265/35/16s aren't available at all it was a listing error ffs

that will give me a 1" drop nose to tail.
i can then lower the whole car 2" but if that isn't enough im gonna need eccentric top mounts, coilovers etc.
at least the small front tyre will give me over 1" head start
and make the car nose down slightly which it needs to do to look right.