Certainly a DIY project. I bought an all fiberglass ducktail. Like with anything glass, you'll have to drill some holes and do some sanding to get it all smooth. I had to fabricate something to mount the rear evap to (short piece of PVC pipe) but I later removed the A/C.
Best solution is to have one mounted to your existing lid but then you can't go back. I think it's Sonjay (?) here on the board that will do it and the feedback on the board is all very good.
I had the body shop paint it. Very pleased with how it all came out.
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'84 Carrera (recently sold

)
'67 MB 250SL
A few Italian motorcycles
......and a minivan for the crew