So my players are going on a big game hunt, how would someone go about turning creatures from this http://starwars.wikia.com/wiki/Ultimate_Adversaries to edge of the empire.

When I needed a beastie for my most recent session, I used the stats for a gundark from the EOTE book and modified them. Depending on which creatures in that book you wanted to use, I'd compare the WOTC stats against the various adversaries in EOTE and find the one that was a close fit, even if the fluff text didn't quite match. You can cover that up with narration and description.