Hi Mark,
Doesn't look too bad - I was expecting much worse. In fact, it looks like the bike was well cared for until it's mishap ...
1. Wheels. No, they're not the original ones - which is a Good Thing 'cos the originals were Speedlines which had a history of breaking, sometimes with fatal consequences. They were put on recall by Ducati and replaced FOC with FPS wheels such as yours (look back thru the postings for more info on this).
What has happened with yours is that they have been replaced with FPSs which only have
4 bolt holes for the brake discs - so you've also lost the original
6 bolt drilled discs. You could hunt around for a set of 6 bolt wheels and discs to match, but it really isn't that serious.
One thing you do need to do: take the rear wheel off and check the security of the cush drive housing. Early FPS wheels suffered from the countersunk fixing screws coming loose. Undo them and refix them using Loctite. And/or you can replicate the fix at the time which was to drill two small additional holes and insert roll pins.
And get rid of that bloody useless Metzeler tyre. They are appalling - I wouldn't be surprised if they were the cause of the bike falling over in the first place. Use Avon Roadriders or Bridgestone BT45s.
2. The missing rear light mount is a bit of a bugger. It's a Darmah special, with the indicator arms fixed to the side. Hunt around, call Phil Hitchcock at Road and Race etc - you're probably in the best country in the world to find one !

.
3. The seat pan may be repairable; or, better, see if you can find a good replacement - maybe one of the Ozzies on the Forum can help with that? It looks like the bike is going to need a full re-spray anyway, and you don't want to get the pan repaired only for it to crack again after painting.
Decal sets (dark blue flashes on the fairing, white lettering and Tiger heads) from loads of places including Steve A. and Motographix. The underlying light blue was (or was very similar to) a VW paint, VW marathon blau-metallic (L96M) or VW A01-127717.
4. If the bars are stuffed, don't bother looking for originals. They weren't too clever. I'm fairly sure MHR bars, for example, will fit, but check.
5. Have you still got the front brake master cylinder? If not, the original round body ones do turn up on FleaBay - the original size was 15mm, altho' I prefer to use a 12mm off a Pantah. Overhaul kits are still available - again, Steve A. or someone closer to you. Otherwise, fit a later, square reservoir one.
6. Rev counter. Readily available, normally for not too much. Fitted to all Darmahs, MHRs and Pantahs of the period. Just check the case is in a good condition - lots of second-hand ones have minor dings.
7. No, the pod air filters weren't original. All Darmahs came with air boxes. Frankly, what you choose is largely a matter of personal style, rather than performance

.
8. Headlamp shell. I
think this may be the same as a contemporary BMW model - but check with Phil Hitchcock. Good that you've got the support bracket, even if it bent, btw.
9. Indicators, stems, can - all readily available. You just need cash!
HTH - anything else, just ask.
Ciao
Craig