Hi,

I'm building a kids' treehouse, mostly out of pressure-treated lumber
(the "good old" arsenic-laced kind).

I'm thinking about making the treehouse floor out of Trex or something
similar, since kids will be sitting, eating, etc., off the floor of
the treehouse regularly, unlike the way that a deck is used. Also,
this would avoid splinters.

The extra cost would be about $140, roughly doubling the treehouse's
materials budget.

Does this sounds crazy/reasonable to you folks?

Also, since the treehouse is 7' square, I think that I will need to
buy 16' lengths since Trex doesn't come in 8' lengths, and neither 12'
nor 20' lengths are practical for this purpose.

Is Trex easy to cut with a circular saw? What about with a decent
hand saw?

Any other suggestion for suitable materials which might be cheaper?

TIA,

Jonathan