It all depends on what you want to use it for. Generally speaking a good solid bug is very capable of handling abuse. Most off road stuff is pretty much steady going, the vids from the front, (there are more in various show scene threads) are at santa pod where we had a course dug for us. This is now a permanent feature but in a different area and set out differently. The course is more technical and the obstacles closer together so less jumping is likely. That's likely to be the hardest any of us will ever use our cars!
Green laning is actually on public byways so they are by definition accessible and passable however some are harder going than others, particularly in the mud and wet!
A baja kit is recommended for this kind of use as the front and rear of a stock beetle are quite likely to get damaged or stuck!
Adding an adjustable beam will give you extra clearance at the front and generally raising the rear can be done in a day with no huge difficulty. Depending on your skills a baja kit should be pretty straightforward to fit, you'll just need some accurate measuring for the front nosecone or the bonnet will not line up.....few are actually a good fit anyway.

The wings use the stock beetle bolt holes so no great hardship there and the rear cowl is a matter of personal preference, some like it some don't.
Be patient if you want cheaper tyres, they come up here and on ebay fairly often there's a wheel and tyre thread so you can see what some of us are running.
