On Thu, 10 Jun 2010 13:19:26 -0700 (PDT), karchiba
wrote:

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?

No plans, but a question. How big is your welder? 3/8 aluminum will
take quite a lot of current, 300 amps or more; beyond the practical
range of a small welder/torch. You can extend the capacity of your
welder by preheating large pieces. But I'd say 1/8" to 3/16" material
is a better choice for learning to TIG aluminum.

--
Ned Simmons