Welding table construction advice needed

[gtotto]

Hey Ken,
Could you use angle iron instead of tubing for the frames? Use the angle to clove over the cabinets. That would gain some "working" height for your casters. Of course you will have to make sure you can open the doors AND get the cabinets into the frame after it's assembled. Build the lower frame "closed" so the cabinets will sit inside it and the upper "open" so they will slide down inside. The open upper frame will also give you a nice lip for bolting or welding on the top.
Putting the casters on the ends of the table would make the locks easier to access as compared to setting (or hiding) them under the table.
To make the cabinet easy to roll I would suggest at least a 5" caster and as wide as you can afford.

I was thinking of a way to use angle iron as well. The cabinet fronts only have about 1" of exposed face frame and the rest is all door so I dont think that allows my much wiggle room. My original plan was to build 2 identical rectangles out of tubing (both with cross bracing) and slide the cabinets inside. The "rectangles" would be separated by vertical tube legs cut to the same height of the cabinets (plus a 1/4" or so just in case). The lower structure would have cross bracing to support the cabinets and the top structure would have cross bracing to support the top plate. The overall top plate, with overhang etc would be a little larger than 3x6. I think maybe I could add some angle iron to the sides of the structure as a mounting location for casters. I could possibly weld the angle iron high enough off the floor to only allow 1' or so of the caster wheel to protrude from the bottom of the overall structure. That way any size caster would add only a little height. The iron would obviously have to be wide enough to allow the casters to rotate 360 degrees.