I had one that was about that size. IT was great I used 3/8 for the top it was plenty thick for pounding as well as welding even heavier stuff. The leggs were "2" sq tube I think 3/16. and "1" angle for braceing and a shelf about halfway up it was heavy but it didnt move when you got rough with it and we left about 4 in. around it to clamp to oh almost forgot mounted a vise to it also that really worked nice for smaller parts. What mugsy said about the height is right find your perfect height and go with it.
