Commuto-x bike

Whichever you choose be prepared to have to do something like this.

It may but not that noticeable.

P45 might be a tight fit, currently riding with a 33.3c tyres on a P45 and it just about fit (look tidy thought).

If you reckon you have enough clearance for a P50, go for it.

Regarding fit - here's a solution;

two options for mounting the mudguards

anyone good at manipulating metal to achieve the neat bends? or what is the solution that scoble pictured, it looks quite neat, though as the stays are bent in those pictures it seems i would be as well off bending the entire stays