Should I be concerned about rust? Once, I went almost 3 months without brewing and the rollers were starting to turn brown (fixed by running a couple of pounds of base malt through it). Warm water + oxyclean / PBW and rinse in Iodophor and dry thoroughly? Mineral oil? I've disassembled it before, so no worries there.
This would definitely be a good opportunity for me to super-size the hopper at the same time. Yep, that's my weekend sorted.