Depends what you want to achieve, really. From memory those were fun little bikes and would be a good laugh on streety stuff, but they are relatively dated now of course. The good thing is that with trials being rather behind the times compared to the rest of the MTB world, compatibility won't be a huge issue on the most part. Looks like you're stuck with a rear vee on that frame, which some would be put off by so you'll need to make the call there.
If it's for occasional use and just having a bit of fun on, I'd keep it mostly as is and enjoy it as a (presumably) cheap bit of fun. Switch out the contact points (bars/stem, grips, pedals) to tailor to yourself and leave the rest until you've ridden it enough for niggles to present themselves.
If you're wanting to get back into trials a little more then ride it as is for a while, until you're able to pick up something a little better specced and you're golden