That should be an easy enough restoration, it's a relatively simple machine and parts are still easily obtained. There are a few firms that specialise in the whole LC/PV range and thus all the likely faults you'll find are well known, and any services needed are pretty easy to come by.
As to how much work it will be that's a question of how original and/or how well finished you'd like it to be.
Fun bikes too - you'll have a giggle when it's running
.