Seconded! I recently built a large 50" x 90" work surface in my garage and used MDO sign board (another phenolic resin product, not much more expensive than MDF and available at many construction-oriented lumber yards) for the top surface over top of a hardwood plywood subsurface and heavily milled Douglas Fir legs and trusses, all doweled and glued together. I've been quite happy. It was easy to use a router on to make channels for t-tracks, and has been quite stable for the past 6 months or so through the fall, winter, and spring weather changes with only an oil-filled radiant heater to keep things from getting too frigid.
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