I currently own a Mk3 Fiesta RS1800 track car that is in need of re-shelling. I'm aware that there are what's considered Mk3 and Mk3.5 shells with the latter being used on the Si. What I need to know is are there any limitations as to what shell I can use in order to house the Zetec engine?

I know the FRST only has a rear engine mount whereas the RS1800 has front and rear, but can the chassis leg of a FRST shell simply be drilled to accept the Zetec front mount?

Also are there any other issues that may come up transfering RS1800 components (suspension, lower arms, rear beam) to a FRST shell? The engine management/loom, electrics and fuel system are completely aftermarket so they're not an issue.

Any advice would be greatly appreciated