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Until your partner realises how cushy 42c is and wants to maybe experiment on road with 42c and mudguards.
Just hypothesising obviously. But the bike should be able to do it in the future if your partner wants to do it in the future. I know you know this but the whole point of a custom or semi custom bike is not compromising on anything. If 42c and guards are supposed to fit, they're supposed to fit and I wouldn't settle for anything less.
Yes but you'd think some tweaking would be possible. Someone else out there must've received a variant that fits 650x42 with fenders?