Cleaning up, found this.
Used to have a shell but the screw posts became brittle, was going to glue together but I can't find it, if I find it I'll update.
Works with Castlevania 3, tested on AV Famicom and regular Famicom. The adapter had a couple traces rewired to work with Castlevania 3.
23.00 shipped in the US.
Labyrinth boot english translation.
This was not working when I go it, bad rom, so I replaced it with the english version.
25.00 shipped in the U.S.
(https://i.imgur.com/gzEcT9t.jpg)
(https://i.imgur.com/hpLeB5U.jpg)
(https://i.imgur.com/CvBWwtQ.jpg)
Added labyrinth cart.