Heh heh, yeah, it's a 61 c-c.
FWIW, I won't be using disk brakes. The sliders come with a disk brake tab by default. I just haven't gotten around to cutting it off yet. So there's that, at least.
My concern is simply that the axle is so far behind the seatstay, rather than under it as it is in traditional drops. So rather than loading the seatstay in compression (taking a lot of load off the chainstay connection), both connections are in torsion.
And yeah, I've been going through Flickr and seeing all those bikes built just like this one, so maybe I'm overthinking things. I just don't know. Guess I'll leave the frame unpainted and try riding it down the stairs.