Have you got a voltmeter and tried to measure the output from the alternator before it gets to the rectifier. Not entirely sure but I think you should see about 25v AC. Yep AC so make sure you've got your voltmeter set for AC not DC. If no output look at Alternator, could be brushes or open circuit windings. Brushes easy to change, windings, sorry think your looking at a new alternator

Assuming this is ok then with engine running you should see about 14V DC trying to charge the battery, measure this on the other side of the rectifier. If no output rectifier could be open circuit.

Worth trying to check with voiltmeter on AC range again, you should not see AC voltage trying to charge the battery. If so you might have a short circuit rectifier.

If rectifier is either open or short circuit then should be straightforward to get another one, although cannot understand why manufactures charge so much for what is basically a bridge rectifier which must cost pennies to produce.

good luck, and interested to see how you get on

The brake lines just need to be the correct length to match up with the attatchment point for the calipers. If you can get the radial master cylinder off the GXSR or a Zx14 to replace the Zx11 stock one as this will improve things more than the caliper swap.