No plug on the toptube? Also the clearance between the seatstay bridge/end of the toptube to tyre seems to be really tight on that first one (even with a pretty dead tyre), and with the wheel fully forward would it take a new, large volume tyre or is it just the angle the photo's been taken at? Also, I'm not convinced that you're going to be able to tension the chain sufficiently by hand as it stands, and with the chain in the way it could be kinda awkward to do. Otherwise look really nicely finished and pretty well thought out. Too low for my liking but then that's modern frames for you!