Maybe Make a Suspension Assmbly, or part of it, like a Bearing block with some mock axle going through it and then you could attach like a mini rim n hub or something. If you gotta pay for it yourself it'd be justified to make everything except the axle out of Aluminum.
Or you could make a steering column assembly, a bearing mount with a colum going through it and you could turn n mill your own sterring wheel, you could also cut fancy dsigns into the weel with the other machines you've got access to.
You'll get your tolerances from having to house bearings and you could really just go nuts on a steering wheel or rim & hub design