Well they are already very good at building shelters, Orangutans, Gorillas, Chimps and Bonobos are well known to build nests in trees, but they also make use of overhanging tree branches and brush for shelter, and have been seen making their own canopies out of brush and leaves. Yes. They know how to deflect rain from overhead.

Orangutans have been seen using large leaves as umbrellas.

What scares me, that people will see what they can do, and attempt (Or reattempt, i'm sure it's been tried before) to enslave them in some way.