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..move brake bridge, then discover chain stays don't allow 28mms plus mudguards, refabricate whole rear end for £200, then you may as well convert to discs (£150) and electric gs (£500), more puppy killing and brazing ensues, another £200, of course a respray required, £100... £1,150 later and you wish you'd thrown it in the canal and bought a jamis on the btw scheme
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It doesn't look that bad...
You'd probably be fine with no bridge and no brake, a disc tab would likely make the frame crumple into a ball of flames.