I seem to remember that someone in Italy made a small business out of it but I really don't remember the name.
Engine was boosted up too making a very entertaining package.
The question though is why would you want to? Autocross? yep although it is a bit heavy for that...
Regular road use? not sure that is necessarily wise. I've seen enough crashed Clio V6s (not to mention driving short wheel based mid-engined cars) that the format, while fun, is not well suited to wet roads or emergency stops.
But if you must do it the formula is something like this:
Mark out where you want your new suspension to go.
Chop out your entire rear suspension.
Create a subframe for the engine and suspension. (so easy to say...)
Weld in suitable mounting points on the chassis.
Mount the subframe - the whole thing needs to be adjustable to ensure the alignment is accurate down to about 1mm.
Create a firewall in the chassis.
Relocate the fuel tank to the front complete with plumbing. (or use a ready made bag tank).
Rewire the car - actually this is one of the easier bits since the engine pretty much runs off a few plugs...
Find suitable suspension spring and damper rates for the front and rear. You'll need a new ARB at the front too as the original one will be too stiff.
Realistically what you are doing is (approximately) spaceframing the rear of the car, you'll need to reinforce the front too as the engine provides some stiffness that you've removed.