TBH to build a Gp4 version from original shell and parts now with a BDA or BDG would cost the same I reckon and there's a fair few of them around on the rally scene .It's saying something when they need to limit the run for a £300k car
The "new" one will have lost the handling of the original for sure.... even when we put all the Mk2 running gear in a Mk3 shell with the same wheel base and track it never handled like a Mk2 for some reason