Your master bedroom will be 6′-4″ x 7′-10″ and kids’ rooms 4′-8″ x 7′-10″, according to the dimensions, counting 4″ for interior partitions, not counting any space consumed by shelves. I presume the shelves will be above shoulder height so the floor space can be walked on. I can’t see any chance of adding a woodstove to the MBR at that size. What if the hall ends at the MBR and has its door on the north side? That gives significantly more space and would allow a very small stove in the room. It wouldn’t have to reduce the bookshelf, just put some of it in the bedroom. I realize the ground slope would be an issue, but you can’t have a berm against a cordwood wall, the ground has to slope away from the base of the foundation for at least a few feet to avoid damp walls & floor.
You don’t want the shoes/hats/gloves space at the northwest corner; things will not dry well there in winter. You want it on an interior wall, or better yet near the heat source.
How much sun do you get in winter? I know that here in upstate NY my south-facing house can be comfortable from just sunlight on a sunny winter day, but there are many more cloudy days when the windows lose more heat than they gain. I think your configuration, three to four times as wide as deep, will lose too much heat and the bedroom end will be very cold. Maybe pulling the storage room to the north wall, and putting the bathroom on the north wall next to the stove, would allow a distinctly more compact and easier to heat space. Also, a more compact space will require distinctly less exterior wall to build, which at 18″ thick would add up to a lot of labor saved. Stretching the end walls 5′ and shrinking the long walls 10′ would give you 10′ less cordwood wall to build, and increase the interior space by 55 square feet, effectively a second master bedroom.
I look forward to seeing how your housebuilding progresses.