yeah, there is a lot of elephant grass around here, the farmers use them as beanpoles, and some kind of straggly thing that i think is the basis of the thatching that is used for the thatched roofs.

as for actual big tall trees, that's literally just a matter of climbing some mountains around here, there is all the straight tall eucalypts you could want, on land you can't use, that is hard to get to but hey, you get up there with an axe and the hardest part is dragging it back down to where you gonna use it, but there is no shortage of viable building materials, stone, that's another one, if you have got concrete, but even if not, the centuries of people living here were piling these basaltic rocks up to make terraces for ... centuries, and i'd guess that between mud and thatch and piles of rocks you can make a very cosy dwelling here

the modern concrete shit is actually crappy, mainly, because there isn't a fire in the middle of the house, it's damp here, you need to have heating about 6 months of the year, not a great deal but more than you need to just cook your food