C1 Models is doing a VW CADDY MK1 transkit for the Revell VW kits , set to be released at the end Oct, you can pre order it now for £42 plus shipping( current exchange rate its $64) .
Kit includes; resin body (bed floor and tailgate cast separately), working tailgate, rear axle and suspension, fuel tank, spare wheel, clear parts for rear lights and rear glazing, plus interior door cards. There will also be brass rod for the tailgate hinge and underside details [Some parts not pictured].
You can use either of the recent Revel Mk1 Golf kits for this. Some modification is required to the chassis to fit.
http://www.c1-models.com/