1. None, expect you may need to do lots of vias
2. D9: search a zener diode with zener voltage of 34V and with DO-package (lots of them available)
D10: as reference see
http://f5soh.free.fr/ftp/Doc/General/PBYR1645.pdf . There should be lots of similar/equivalent parts available. Also D10 can be left out and replaced by short wire.
3. I haven't characterized that. Around 1.5A could be a good guess.