Looks really nice. The only thing I would add is I try to put the cable stops on the tubes where they're still butted, which yours look like they probably are anyway. I arrange things so the longer butts of the TT and DT are near the HT end on the theory that you probably need a bit more strength up there anyway.

As for the gear cable stops I have used some cast ones similar to yours that attach about where DT shifters used to go. But some bikes have ones that attach directly to the HT itself-- they're usually sort of cone-shaped. That looks like a good design to me as the HT tends to be quite a thick tube and putting them up there means no rubbing.