This all hinges on what triggers someone's base as raidable. You can get lucky and find a powerful weapon or tool even at a low level. Besides, I didn't say newbie, I just said younger, as-in they haven't hit the raidable trigger yet. Turn about is supposed to be fair play and all that.
If the settings were all configurable by the server manager then great, I'd say let it ride no matter what and let them figure out what works on their server and what doesn't. I think it is going to be impossible to make even most people happy with a single set of rules for PvP. This game is too awesome for one set of rules anyway.
This is a crafting game and some people will want to focus on that and include base building in PvP part of that. This is a survival game so some will want to focus on that and consider base destruction in PvP as part of the equation. But I'm not saying anything you don't already know, so, yeah.
Just put some of the ideas into play, make everything optional/configurable, let us test them out, and then adapt from there. As a community I'm sure we can provide adequate feedback. If not, raid our bases and boot us off your server.