There's lots of ant build guides if you know where to look, the RW101 forum - which is where almost all the antweight builders congregate - is a pretty good place to start.

I personally quite like these kits, there should be a fair few people with 'proper' 150g antweights at each RR event who'd be happy to put them into the arena and fight (and hopefully beat! heh) the superant kits, and that would be a brilliant demonstration of what can be done with the antweight class - hopefully we can hand out our usual leaflets then and recruit a few more new ant builders ^^

I would however disagree strongly with this:
these 150g little machines have developed so much that equally with the feather weight class, it has become more and more expensive and challenging to build a new competitive machine.
Personally I don't think the cost has increased to any great extent, it's possible to build a very strong base for an antweight for only about a tenner or so more than the cost of the kit, minus radio gear, and newcomers with rather cheaply built machines have made the top six at recent events so I don't think you necessarily need to spend to be competitive a lot of it's as much down to luck and driving as it is to build quality and weaponry.