The list goes on of people who are capable of carrying out this conversion properly.
Only issue is money as its not cheap done right.
A mate of mine had or still has a new Gartrac mk4 convertible shell, its a right shame its a cabrio as I would of probably had it off him.
He also built a Escort Cosworth convertible using the genuine inner wings and all other panels from a Esc Cos, most people think its got a rs turbo engine under the bonnet, little to they know its actually got a T4, 8 greens and plated diffs all round lol
I'd imagine your looking at 5k to do a shell properly and you need a mint one in the first place too !
Cool project though, ultimate sleeper if done right