It's a kick in the guts when you see that, however I would recommend.
1. Buy new rear 1/4 panels - which now exist.
2. Bonnet looks repairable - so fix that.
3. Front wings are not too bad, but may be easier to just buy new reproductions?
4. Buy new doors.
5. Unfortunately roofs are not yet available, but may be soon from KF Vintage.
6. The front rails I believe are available via KF Vintage or some other outfits.
7. Floor pans are common enough and available.
8. Cowl looks fine to fix.
9. Spare wheel tub, unpick and replace with new reproduction.
10. Buy new sills/rockers - which exist.
11. Reproduction rear hatches are also available.
Simply buying all that stuff will cost a small fortune, but you could ship it in bulk. Simply placing some of them on the car will make it look like half the work is done already, you'll feel better. Plus whoever does the restoration work will be glad you bought that stuff (since your Perth shop may not be aware these sections already exist). It's almost always cheaper to replace than repair panels in my experience and less time consuming. So whenever something is available now, I just buy it.
The only areas that sort of concern me is the front strut tower on the inner wing that's rotten at the bottom. But it's not uncommon and fixable, just more work. The tool box area, is tricky to get to and fix. And under the cowl panel area. But it's not problem per se, just more work than the other sections which are more accessible.
FWIW, #51 was similar, although perhaps not as bad, but the benefit is when I bought it, I could see all that already. So I knew what was gone. I've been slowly acquiring all the sections.