Some progress. Actually quite a lot ...
Most of the summer was spent removing the old underseal ... those high temperatures were good for something as it softened it up although being covered up in overalls, gloves and goggles to keep ME clean was not pleasant! A lot of scraping (and I mean a lot!), occasional use of a heat-gun (yeah that helped me stay cool - NOT!) and a couple of large bottles of white-spirit and lots of rags has got it all off. The areas of surface rust were wire-brushed back and treated with Hydrate-80. Any bare metal has had a thin coating of etch primer.
Which means that the main welding can now start. I've started with a few small areas such as a patch in the nearside door A-post .. just above the top hinge. When I really looked at this it wasn't worth removing the entire post panel, which would have been a mission to replace, so I patched it and added a plate behind to give it a bit of support as well as deflect any future rain water away from the back of the A-post. Also been welding up several holes .. mostly drilled to hold relays, etc. They won't be needed in the engine bay .. relays are all going to be behind the dash.
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Removing the underseal showed up a small area of rust in one inner sill near to the handbrake mount* but this wasn't major, so that has also been patched and I overlapped the edges (joggled!) for a bit of extra strength (as well as learning how to joggle!). That's been stitch welded and plug welded along the joggled edges.
A lot of cleaning up of those dirt traps in the engine bay and removal of yet more sound-deadening from boot floor (which showed up a couple more rust holes!).
So I think I know where all the patches are now needed ... that's probably most of the first half of 2023 allocated. By the summer of next year I should have a solid shell, which should be just right to get it all primered in the warm.
* For those of you who aren't familiar with the A35, the handbrake is on the driver's right between the seat and door! Makes hillstarts fun! That will NOT be going back in the same place.
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The forerunner of the Mini .. the A35 .. lots of similarities except rear wheel drive. Mine contains a lot of Mini parts now!