I’ve completed the wrapping of the drop-outs with sisal. I’ve also added stay support bars near the bottom bracket and seat-post to give the frame more stiffness. Here’s some pics:
The clearance between the last cog and the chainstay wasn’t something I thought about that much. Luckily for me there’s about a 3mm gap to spare. This will be a single speed bike, so there will be plenty of room anyway.
The chain tension screws were also a very close fit. I actually had to cut away at the joins a bit to make them screw in properly.