Internal routing of derailleur is unnecessary, bad for shifting, and....
you'll have a hard time getting from the top tube to the chain stays ;-)
But looks good and hope all goes well!
Sorry seatstay.
I’ve had frames set up like this at a past gig, and with modern full length housing didn’t have any issues with shifting TBH.
@bright started
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Internal routing of derailleur is unnecessary, bad for shifting, and....
you'll have a hard time getting from the top tube to the chain stays ;-)
But looks good and hope all goes well!