Just catching up on some NYSB reading and came across this thread, which I think I have some useful info to contribute.
Harv, you've seen our place, but you prob weren't paying attention to the siding at that time. It's fiber cement board (i.e. Hardi/LP/etc) for the horizontal lap section in the lower areas, and then real cedar shake in the gables and all the trim board are cedar. We actually used a product that is made by a company that takes the standard Hardi/LP/others material and puts their own coating on it, with benefit mostly being the two toned look to mimic more of a wood than what you typically see with Hardi plank in solid colors. Each brands warranty still applies. Maybe this is of interest to you if debating on fiber cement options and maybe being hung up on the color choices or maybe wanting more of a wood look.
https://woodtone.com/product/rusticseries/
We actually didn't buy from this exact manufacturer, as it's based in Canada, but we bought through a distributor who sells this same product under a different name. Could provide you with more details on that if you wanted to pursue it, too much to write here. This is going back to 2017ish that the place got sided.
It's held up very well, better than all the real cedar which some could use more stain again.
As far as the ends go, as I see was already mentioned, you coat the cut ends in the field.
Ours is installed over Zip sheathing, which has all the seams taped, and as previously mentioned eliminates the need for any house wrap product. Really like the zip system, started seeing it up north alot, and now we see it all over the place down here at the shore. Seems to withstand LONG periods of exposure to elements prior to siding going up, even though I'd try and limit that of course. I know a few places that I see regularly in both locations that seem to have been sitting in Zip for years now...
If you're up in the ADKs next week by chance, and feel like swinging by LP, I'll be up there and you're welcome to come see it in person if interested
*edit: I lumped LP into the fiber cement category even though it's an engineered wood, but for the purposes of my message I think you got the jist. I was thinking in hardi terms since that was our route