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Yes to both. Completely sacrificed the old headtube to make sure I lost as little of the DT/TT as possible, probably 2-3mm?
I've got some hefty box section to brace between the bottom of the HT and the middle of the DT, which will give a flat surface to bolt the rack too. As well as a small bit of plate to go on the front of the HT that will bolt perpendicular to the bolts on the brace for more stability.
Made a good start ruining the Genesis. Chopped the HT off, tidied the TT/DT and brazed on a new, longer HT. Prepped the frame for cable guides/bottle bosses/HT reinforcing rings to go on tomorrow. Pretty much everything has arrived apart from the Bike-discount.de order which has all the wheel bits, the rear tyre, and the cassette, hopefully that'll be here tomorrow. Aiming to get the frame sorted and built up so it's rideable first, then make the bolt on rack.
Had a minor break through with the brazing, adjusting to a much smaller cone on the torch, makes it a lot easier to control the heat. The new flux is much better too.