Found this pic of a 46 Ford convert on facebook today with half frenched taillights. I'm guessing you use half a french light bucket for the innies, but how would you go about doing the outies?
If you are a do it yourselfer you use exhaust pipe for both sides. Unless you have a lot of really expensive machines in your shop
Exhaust pipe, metal cut out of another body or other metal with "the needed shape" were how most custom work was done for a long time. You never see a brake or English wheel in old customizing articles that I can remember.
Pretty much as described above for all frenched tail lights. I used 3" header cases for my '59 Caddy lights on my '53 Chevy pickup.
It looks like the outer half could be constructed from a U shaped bend in some sheet metal. The radius of the U bend comes from the tail light. Either sink the U in to the fender, or trim the legs of the U to match the curve of the fender. I like the look. Different from the usual tail light treatments. Sent from my iPad using The H.A.M.B. mobile app
Paper mache plugs with glass laid up over it. The bucket got glassed in and lots and lots of mud. We are new millennium builders and do not remember lead first then mud later to make custom. We think that everyone had a full sheet metal shop at their disposal.