I guess the chances of it being usable, or at least repairable are higher than if it was an A2000 or A500 with an old RAM/RTC expansion with exploded batteries. But you do have to remember a lot of old A1200s, A600s and CD32s develop capacitor problems which can stop things from working until they're replaced, but at least the damage caused by them exploding is less than that from a big old barrel battery.
At least a few defective A2000 had descent parts in them, one was filled with cards, including a GVPHC8II with 4MB and an A2320 another one also had a GVP HC8II with 8MB.
I even picked up 3 A2000 which one of them had a GVP 030 Combo in it, I said to him if this card works I'll give you the 100 euro right away
And on the A2000 you can always extract everything, take out the PSU and floppy drives and if your good, desolder the cpu slot (yes these will fetch something).
But an A1200 is useless unless you have the proper tools like a hot air station to desolder the ic's, if you only consider the housing and kickstart, it would be an expensive 40 pounds.
