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Sorry, I should definitely preface that with...
“I am not a frame builder but...”
I think as you’re using lugs (and therefor lower temperature) you might get away with not reaming the seattube.
You’ll probably get some corrosion inside it from soaking flux off but you can make a tool out of a mudguard stay and some wire wool/scotch pad etc that you put in a drill that should clean that up easily enough.
Might be the same story with reaming the headtube but if you’re getting it faced then you might as well get it reamed. It’s like, put 2 cutters on the tool instead of 1 cutter and 1 guide bush.
I'll be cutting a head tube so it will definitely need facing. I'm wondering how necessary it will be to ream it and same goes for the seat tube.
Its possible I can get away with not doing it and still have a headset/seatpost fit correctly? The tools are quite an investment but I'll try to borrow or pay someone to face the HT if that's all that needs doing