Thanks all your comments, and kind words.
I went out and had a good look over her tonight, and what really stands out as being in poor condition is the bulkhead. If the chassis is in reasonable condition, and I end up keeping her, I may be looking at replacing the bulkhead altogether.
How hard can it be?
It looks as though its just a bolt on/ off thing, I assume if I did it myself, start to finish, It'd take a weekend or two? It'd mean it would be solid for a while to come, and also give me a chance to sort out the wiring, clean up the engine bay, more access with bonnet etc. off, and tidy up the dashboard when refitting it.
Question is, how much could it cost?
Second hand bulkhead. £100 - £200?
Paint, and bolts etc. £50
Time - couple of weekends?
Am I being unrealistic?