Aslong as your not a complete dumbass edge sections missing isnt a huge deal.
The onyl thing that is gonna make it so you can't give the ski a little bit of work and ski them fine on the mountain is if there are chunks out of the actual core.
http://www.telemarktips.com/BaseRepair.html
Personaly i bought 2 pairs from him, should be getting them any day, and i have no doubt that at worst they will be useable in the park with a little bit of work.