Teak can be brittle, but no more than some other woods. I have used it for handles and as said previously because of the high oil content does not need any treatment to preserve it at all. No reason why you could not use it. If it's any good, I wouldn'd mind a bit of it
The only drawback is that it can be a bit boring to look at! But, if the wood you got hold off is from an old building, that could be completely different because what you would have then is "old growth" which is far better quality, probably less brittle and denser, possibly with better grain, than the carp you get (at vast expense) nowadays.