Thanks for reading the article! I've learned a lot since then and should probably update it ... After having done a frame-off resto on a '49 4400 ...
To answer some of your questions:
How hard to park and store -- Depends on your space. If you want it under cover, and you don't already have a big enough shop or outbuilding, then you will probably need to build something. I see of lot of big trucks parked under pre-fabbed car port structures.
How hard to work on -- not that much harder than pickups. But some of the components are bigger and heavier (wheels and tires, brake drums, etc. Brake parts can be hard to find, but not impossible. You won't find them at NAPA ... probably. You will get to know the parts guy at the place the farmers or big truck guys go for parts.
Some parts are just not available in reproduction. So don't expect to find too much at the restoration parts vendors -- Just cab interior pieces.
You are on the right track to find a good, solid unrestored/unmolested truck and just drive it and enjoy it. Fix it up as you go. If you find a nice driver, probably the hardest thing off the bat will be finding tires. When you do, they will be expensive so prepare for *that.* As I recall (and Ed probably knows ...) a 4100 probably takes a 7.25x20 bias ply? There is a radial size that will fit I think ... (with tubes and flaps, of course), so radials aren't out of the question.
Looking back, I wish I had not done the frame off.
