I'm with you Jon - I have 2 or 3 of dang near everything in the wood shop - 2 table saws, 2 radial saws, 2 miter saws, only one (woodworking, that is) drill press, 3 router tables, 3 jointers, 2 planers, 2 band saws, a pocket hole station, plus 3 or 4 separate routers, various sanders, 2 belt/disk sanders, 3 circular saws, 2 recip saws, 2 jig saws, and then there's the SEPARATE metal working shop area....
The advantage of this - I can set up 3 router tables, one with raised panel bit, one with stile bit, one with rail bit, using scrap pieces of intended materials - I can run all the material for a complete set of cabinet doors without ever changing/messing up the setup, and if done correctly the FIRST time, every single door will fit PERFECTLY. Some of the OTHER duplicates just sorta happened, the smaller 6" jointer was inherited and gets used for "junk" projects instead of using the Powermatic 6", and the 12" spiral head jointer happened when I got about 2200 board feet of rough-sawn oak planks for a bit less than firewood prices.
My shops aren't heated except to take the chill off a bit, they're un-insulated - my "de-rust" methods are: first of all, NO WD40, I find it just gets gummy after a while and doesn't belong in a WOOD shop - all cast iron surfaces get multiple coats of
Johnson's Paste Wax (no silicone to mess up finishes), then each power tool gets at least one
clamp light fixture with a 100 watt bulb inside (two on the jointers) - these get hooked up to a power strip that's fed by an SCR
"motor speed control", set at around
50% and left on all but summer time - This keeps
ALL the metal surfaces ABOVE their dew point and the bulbs pretty much
NEVER burn out, so I
NEVER get condensation (in rainy Oregon)
The light bulbs help keep the rest of the shop a bit warmer than it would be otherwise too.
It's a little more expensive, but I NEVER use combustible fuels for heat, only electric and not too much of that - all fuels produce a LOT of water vapor that I DON'T NEED helping things to RUST.
IF the OP goes with container(s), I'd recommend ALL the methods I outlined above PLUS a continuous-drained de-humidifier as mentioned above - in addition, maybe even a taut line at ceiling height, centered and running full length of the container, with a tarp draped over it and down at the sides, just in case the container decides to drip a little - the de-humidifier will eventually lower the moisture inside, but I tend to believe in backup plans
HTH... Steve