H,
If you are not too bothered that you MAY get a 'Q' registration then you should be able to source plenty of 2nd hand parts ... seats , wheels, weathergear etc... see for sale section. This could make the car end up being cheaper. Not sure if the starter kits now are for de dion & / or live axle, if you go the live axle route you can specify that the chassis be built allowing the Ford axle instead of the Ital.
I went this route in 1998, call if you want to chat... 0114 274 6166
Mark.