Right. At the moment this isn't really a build diary, it's just a few ideas being scattered around, so now I need to figure out just what I'm doing.
I said I'd make a parts list, but to be honest I'm still not sure what I'm looking for. I have a list of ideas but I don't know which ones are good ideas and which ones aren't. Some straight-up advice would be fantastically useful! Look at Torrent's 'build' diary for the kind of thing I'm thinking of, and I'd like it to be reasonably cheap.
I know the basics of what I need i.e. motors, an esc, Tx and Rx and so on, but which ones?

First, motors. I'm looking at the RoboChallenge ones, and have been told they'll do for a simple pushbot. I'm assuming two will be enough? Or maybe not? You can tell how clueless I really am!

Second, ESCs. BotBitz TZ85a ones seem highly commended, but I've heard good things elsewhere. What am I really looking for?

Third, batteries. LiPos are the preferred choice among most of you. I've heard somewhere around 6 or 8S is best, and 3000MaH is what I need.

Fourth, Tx and Rx. I think 3-channel would be preferred, since I will put a weapon on eventually. Other than that, I hardly know anything.

Fifth, armor, bulkheads etc. I'm definitely thinking HDPE, since it's easy to cut, and I can do it with a simple saw. I understand it needs to be quite thick. I'm trying to remember how thick the armour was on the machines at the champs... something like 15 to 20mm bulkheads/chassis with thinner armour, like 10mm?

I'm sorry for how little I know. Despite reading through the build diaries, somehow only a little seems to stick. Once I have the basics down, I'll stop asking stupid questions!