Just read the full thread, I love your dedication, and the paint finish is amazing! I was a bit shocked to see the rot on the sills with the rest of the bodywork looking so clean. I'd probably keep mine in the same condition if I had a garage! As it is it stands outside all year round getting frozen in the winter and baked in the summer.
One thing I've found useful as a rust repellent (I have a Classic Mini which rust as soon as it rains!) is a product called ACF50, It's from the States, all the bikers use it here in the UK. It's like an oily substance that soaks in to everything. It was developed for aircraft and it has worked wonders on both the Mini and the BMW. Come spring, just wash the oily residue off and re-apply next winter.