I'm needing some aluminum welding practice, and I thought that making
a step stool would be a "nice to have around the shop" project.

Yeah, I know that I could just buy one.... but i've got many pieces of
3/8" thick plate, and at least one TIG welder around here.

Does anyone have an example of one, which they made, that they'd be
willing to share?

Thanks,
_kevin