I have not heard of the broken axle problem on the local swaps (well since not much are done so i cant keep tab on them) but i know that they have to fabricate new driveshafts for the car. With the SR20DET's, one common problem was that the stock tranny couldnt take the big HP gains...

The B13 is the Series 2 body (1991-95 supersaloon, and 95-99 LEC)

One of the members in Nissanbayan swapped in an SR20DET to his Sentra but i have not heard from him lately. His main problem was getting the engine together and running as he didnt get a complete engine and the guy who did the swap was in the dark on how to do it for he wasnt familiar with the SR20 swap... it's best talaga to get an engine that is as complete as possible and do some research. From what i heard, the B13 is one of teh better cars to use for a SR20 swap from the JDM N14 Pulsar since they are similar vehicles. Their suspension and brakes are also swappable as well if i remember it right