Cabrio TDI?

Guys, I'm just exploring my options here, but currently I have a Jeep Wrangler and enjoy it but gas is eating me up. Its not really economical for me to get a new car (Plus VW has discontinued the TDI for now, except the Jettas), and I like something convertible. (Well that and 4wd, but lets stick to the convertible part right now) Anyway, has anybody ever swapped a TDI into a Cabrio? I'm not too concerned about noise, as the diesel will still be a lot quieter than the engine in my Wrangler (AMC didnt make 'em quiet.) So, has anybody ever done it, and what's the cost exactly? I like the Cabrio styling and interior design (plus its convertible!!)