Names for your drop-out design:
...and my favorite....
It's nice to see the frame taking shape. I can't wait to see those wheels and tires on it.
EpicSeat Tube Connection
I've been a little unsure of exactly how this was going to work out. When designing the frame I liked the look of the seat tube curving back and then hugging the rear tire. This meant that the bottom of the seat tube wouldn't attach directly to the bottom bracket. I ended up creating a flat plate that attaches to the bottom of the tube as well as bridges the chain stays. Should add additional strength plus, this created a potential mounting point for a kickstand.
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I really like the additional bracing. I wasn't really sold on the chain stays (before) because of how much the tube was flattened, but I decided to keep my opinions to myself and wait to see your next move. Glad I did, looks great!
Probably a good thing that you didn't have a "sacrificial spindle" in there. It might have been welded in permanently!
Back to the chain stays, my first thought before you went further was to suggest notching out the tube for the chain ring clearance but I don't think there would have been enough tube left after seeing how far in you had to go.
I had to do that on the Blackbird chain stays and seat stays for tire clearance. I cut out a notch and then welded in some flat sheet metal to box it in.
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