You'll need to use the hubs from a big block engined Astra/Cav/Calibra (1.8>) because the driveshafts/CVs are stronger/larger than the small block setup. Best bet is to go round the scrappies and get the 2 complete front struts and just bolt them on. If you get the struts from a Cav or Calibra, replace the top mounts with Astra ones.
For engine mountings, the 2.0 engine mounting brackets should bolt onto the chassis in the same place the 1.6 mounts do, so pretty much a straight swap.
As you said, you'll need the MPi fuel pump. Ideally you should replace the plastic fuel lines with metal ones too, although it isn't totally necessary.
You should get all the ancillaries you need with the engine, starter, alternator etc, so use them