[Izzy]

Alex - as for the dump - I suggest styrene - it's easy to work with and plenty strong. as for the mechanism - firgelli are easy and contained but a little bulky - a DIY screw drive can be achallenge if your new at it - but it affords you more flexability. AS for steering - look into the TLT front axel - it's economical - but a little wide,space out your rears to match? There are other options for front drives as well - I here that Integy just un-leashed some new axels. There are other twin steer trucks hidden in the forums - go look for them - I bet you will find some other ideas - even on trucks that are not as close to what your building as you think.

Izzy