A small indent in a straight seat tube would have been another option.
Still lovely though.
The indent would go all the way through the tube if you wanted to make room for the tyre with the wheel fully forward in the track ends.
If the straight seat tube you've drawn in met the bottom bracket in the correct place, you'd get away with an indent;)
@gbj_tester started
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A small indent in a straight seat tube would have been another option.
Still lovely though.