If you are talking about a complete rewiring job from headlights to tail lights . . . Complete wiring harnesses are availble for most Beetles and it's a pretty straightforward installation, but it's very time consuming.
Profesional Mechanic X Lots of Hours = LOTS AND LOTS of $$.
The good news is that Beetles (especially older ones) have a very simple wiring harness. If you have the body off and every thing stripped out of it, it's really not that hard to run the harness yourself . . . and if it's a pre-73, the wiring diagrams are pretty easy to follow too. The 73 & later diagrams are a challenge for the shade tree mechanic, plus there were more electrical goodies in the later years. If it's a 73 or later, it might be worth the cost of a profesional, but 72 and back, I'd say do-it-yourself is the way to go. :alien: