Thanks Marc, Cub and Marty!
Unfortunately, I find myself in the same place: Go check the FSDO!
The good news is that getting a Repairman Cert is not a big deal for me. I already have one for my Tango, so I know the limitations and sole privilege. It would be nice if I can get one, but the decision to buy this project was not made on that hope.
I'll probably document as normal and if I decide to try the RC thing, all I'll have to do is fill out the paperwork and then see what the FSDO says.