I understand we're human and all, but come on, we can learn how to do crap! And we have the dwarves, again, who can show us how to do this in a sort-of right way.
We're adaptable, toolmaking, above average sized monkeies goddamnit! You saying the majority of us are incapable of learning anything? besides, who said anything we humies do had to be fancy? Even I could make a chair with enough nails and vaugly shaped pieces of wood; whatever was too long, saw. too short.... nail a smaller bit on the bottom! This is coming from a person with only limited carpentry skills (I used to help my dad with stuff requiring more than 2 hands.)
Wouldn't exactly be comfortable, but it'd be better than standing. And probably look like a bunch of scrap wood bits glued together.... Bet making spikes would be a bitch for us though.
I would imagine anything we did try to do would end badly the first few times though at least. very badly. And result in dwarves laughing at us for our ineptitude with wood and stone. masonry and most forms of metalworking I could totally understand damn near none of us knowing how to do, cause I'm not even sure what all of the tools for those are.
But it still seems like an unecessarily imposed challenge, since we humans are intelligent and quite capable of learning new things sort of quickly. Not like dwarves, but still.