yeah these ski's are pretty simple...and hell if you run into a problem usually its an easy fix
most of the time....i take that back...a lot of the time an easy fix is just as good as a manufactured part...depending on how well you rigged it, its sometimes better, hell over the weekend i just made some sponsons for my 650 from plexiglass i bought at lowes and now my ski can carve like an 800...now i just need to make it faster
but anyways its all about your skill level and how comfortable you are working on things like this...if your not mechanically enclined then just take it to a shop, otherwise TRIAL and ERROR!!
OH and a word to the wise...if your going to think cheap...try it on your own time and dont ask here because all your going to get is a smart ass answer.
Just my $0.02 anyways