Good luck with the project! I´ve seen a model of the mk I (Ford rally) Transit rally servicevan advertised on e-bay. A kit includung an RS 1800 rally car on a trailer.
I´am planning to build a full scale mk II Transit rally service van some day in the future. I have bought an old 1983 bus with high roof and twin.rear axle.
Planning to weld in the rear windows, build a tire/etc. roofrack(in square tubing), install tools/parts compartments and convert it to diesel running gear.
One day....
Anyone who´ve got more pictures of the Ford Transit rally service vans?