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.
You're 100 percent right. However, the various tails of woe I've had from other forum members today via pm about Isen issues (particularly clearances) doesn't inspire confidence it'll be dealt with sufficiently, well see I guess...
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.