Not the usual TREX deck question... proper water drainage
they would look horrible if i cut them, there's no way i could sand them down and have them look natural again. This is Trex, from what i've seen you can't sand them, the stuff sort of melts. If cutting them or sanding them is my only option i think i'd rather take the chance drilling a small hole here or there in it and replace the board a couple of years from now if i damaged it.
(but then of course the color fading won't match, but i don't think that is worse then a board not matching because i sanded it).