I used Lightwave 7.0 and a tut on threading... I used a thread pic from a tut to make the threads... I did the tut like a year ago so I was doing this to see if I could do it w/o any help
A rim design can be just about anything (within reason), but the spoke part should never be more than 1/4 the width of the rim (though it may appear anywhere within that width), and needs a hole slightly larger than what you have for the axle, and needs holes for lug nuts (4 for most cars, 5 for performance cars, and 5 or 6 for trucks)