Tiberius

Hi all. I've been playing around learning trials on a heavy old mountain bike, and I'm looking to get something more trials specific. I would love a 24" bike for more 'streety' trials, but every full bike I've seen on Tarty Bikes and similar costs a fortune. Could anyone give me a list of all the parts needed to build a bike from scratch, maybe recommend some cheap ones, and give me an idea of the overall price? Thanks in advance.