I am curious on why Barter? sure we have the occasional dialog option that uses Barter but more often then not it just reduces how much you pay for something or how much you can get out as a reward.
Considering we have skill magazines that with Comprehension will raise skills temporary by 20 points a lot of skills are not even that essential to be raised above certain points, you really dont need Lockpick to go higher that 80 (well 64 and then use the books with Comprehension perk) as long you have some Locksmith's Reader in your inventory to open pretty much any lock in the game and I dont think there are that many Very Hard locks.
I like your build idea and thats exactly what im going for, the scavenger type of character. But, isnt there someway i can start taking combat skills, or not be killed by the enemies BEFORE level 11 or do i have to wait till level 11 to dish out some damage? By the way, how long does it take to level up? at the same rate as Fallout 3?
Leveling is at roughly the same rate as FO3, although you get some additional XP from completing challenges (i.e. deal X damage with Y weapon type).
As to getting killed by the enemies early on, I was assuming a progression wherein one went from Primm to Nipton to Novac, and so on, in which case the enemies will be readily dealt with. If you get ED-E as a companion in Primm it will be a big help until you can get some better weapons. I always travel that route early on (although I don't always get ED-E) since I know many other enemies would be too much when building that way. That's not to say you cannot raise a combat skill early on, my plan simply assumes early points will be concentrated in the skills meant to be maxed. There's nothing wrong with getting them to 50 or so and then pumping combat skills a bit if you so wish; I usually don't, but I am starting to rethink that as I am finding that it would be nice to have a somewhat higher combat skill starting at around L7 or so.
For what it's worth, I have found that having a low combat skill is not all that bad, unlike in FO3, since there are plenty of opportunities to gain XP that do not involve any combat at all. You do sacrifice the opportunity to take certain perks at an early level, however you will be taking them eventually anyway. It's definitely a bit more challenging early on, but that was the whole point since I found that pumping a combat skill really high early on made things a bit too easy even with sub-par equipment. By pumping combat skills later, one does not become really powerful until the opposition does, and many battles remain at least somewhat challenging until you get into the 20s.
EDIT:
@Drakron: why Barter? Mostly because you'll be selling a ton of stuff every time you go to a merchant, but also because a Scavenger would naturally be a good haggler. I suppose you could swap it out for Survival or Medicine, though. In addition, I absolutely
hate getting ripped off so I tend to run Barter up ASAP, and in more specialized builds I also take the Pack Rat perk and that needs a 70 in Barter.
As to the skill magazines, I am not a big fan of temporary boosts and with a 10 INT you are going to cap out multiple skills anyway, so even though it is not essential to do so this build does. Also, you are not allowed to save stuff for later with the play rules I listed, so skill mags get sold if they haven't already been used by the time one reaches a merchant. You're quite right that normally there is no need to get Science or Lockpick above 80 or 90, depending on whether or not one takes Comprehension (and it's actually not a clear choice, at least to me, with only 15 picks), however this is not a normal build or method of play.