Ahh... fendering a Pista....
I used the split-fender system to cover the rear quite well. With no hole in the rear bridge I used a U-shaped hose clamp to bolt the two rear fender pieces to the bridge. I didn't even try to fender the front. I have pretty healthy toe-overlap with the front wheel. I thought a front fender would make that a bit more exciting than I wanted, so instead I fashioned a long, wide mudguard on the down tube out of choroplast (corrugated plastic). My toes get wet, but otherwise it works pretty well.
I got the Pista before there were so many other fixed gear bikes available that are so much better suited to fenders. If I were buying a fixie now it wouldn't be a Pista for this reason alone.