Very nice work in building up your press stand. In fact, you have inspired me to build a similar stand for two of my presses. I'd like to hear about how well the press works once you have the wheels installed.
FYI somewhere in your post I saw that you are located in the East Bay. I found a place in San Leandro to buy metals. It is called Alco Metals, on the corner of Davis St. and Doolittle Drive. I bought all my metal plates and square pipe from them.