Hi Jon,
The Miller ArcStation above is also 30 x 60. Looks like I'll go with 36 x 36 or a 36 x 48 with a 3 or 4 inch overhang back to where the top support connects to the top for a clamp edge - while I'll also add a 1/2 x 13 grid of threaded holes inside the support so I can clamp Enco machine clamps as hold-downs in the grid.
1/4 top is to thin IMO. I'm going minumum 1/2.
Nothing wrong with redesign since you're still in the paper stage. That's the best time to make a change and is the reason I started looking for ideas before I chopped up a bunch of steel.
Jim
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