The table I made is about that size, little bigger. I like it, it's a good size.
I don't know about the casters. I think for welding you want a good solid table that you know's not gonna move.
I use my table for bending also. Sometimes I'll just weld some round bar directly to the table to make a jig for bending. Casters may inhibit stuff like this.
I decided 3.5' was a good height. I'm only 5' 6" so it's a fairly comfortable height for me. If you're taller, maybe 4' would be better. You need to find the comfort zone. Uncomfortable = bad welds.
I used 3/16" thick for the table top. It's not perfectly flat anymore with all the torching and welding jigs to it, but it's plenty good for me. 1/4" would probably be better.
Hope this helps.
-David
Kustoms-and-Sleds
