This mod seems cool! I'll check it out. In the mean time... I have some ideas!
First.... Ideas to improve existing features:
More stuff for bamboo. I've not even used it yet. You know.... Bamboo sprouts (or shoots) are edible.... Perhaps make the little bamboo thickets give off sprouts when you destroy them? That would make it another crop like wheat and hemp!
I think something should be done about the log boat. I know it isn't really useful... but still. 5
logs for a 1
log boat? Kinda wasteful in my opinion.
I'd say if you do nothing with new firearms... at least increase the range a bit on the shotgun. It's range is ridiculous. I don't know about raptors, but everything else would be killed at longer distances. Really though.... I would rather stick with the older pointy stick weapons in a survival game anyway.
Next... New stuff:
Might I suggest flint arrows? Perhaps glass shard arrows as well? Maybe a flint knife? Flint spear? I was always wondering why there wasn't an iron hammer... I wonder what an iron hammer could be used for?
I think maybe a rain catch would be cool.... a MUCH easier to construct construction that gives enough water for some bottles every time it rains. Wells are a pain to build... it would kinda like buildable water rocks I guess. I would suggest a desert still, but I believe there is no substitute for the plastic sheet used for it.
You could, perhaps, make a sling. More range than the slingshot, but slower. Sorta like the longbow compared to the bow. Maybe a Hide + 2 Cords? Maybe it requires a higher hunting skill to make so you can't make it too early? You DO require more skill to use one in real life.... so it WOULD make sense.
Sinew. Tendons from an animal can be used as string. It's possible to make a bow using it. Perhaps adding it to a large animal spoils... maybe obtainable from large meat? Meat in this game seems universal, so who's to know what part of the animal the meat's from right ^_^? If you were to add the sinew directly into the spoils then I would say only large animals could produce it. I guess it could be an alternative for string or maybe even vines sometimes. Other than bows I do not know what sinew could be used for. Thin leather strips (Or strings) could be used sort of like vines or strings.... It isn't very elastic though. But I think it could be useful if anyone decides leatherwork is in order sometime. Or maybe not.... Just make the person use a knife and a extra hide with whatever else the combination requires. That would make it plausible to say you used strips without having to go through the work to implement it.
Just some ideas I was thinking about. Sorry for rambling.