Like I said in your other Sisu post, "I'm beginning to like these 1/32 scales a lot". They look nice and are easy to work with and take up less space. About storing them, why not display them in that bookshelf you have and instead store the books?
For touch ups, I spray a little paint inside a plastic cup and apply the collected paint with a small brush. I do the same with the clear. I only use spray cans.