With benchtop space at a premium in my shop, I made this multipurpose auxiliary top for my tablesaw. It features T-tracks and dogholes for workholding. Handholds make it easy to install and store out of the way.
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Custom benchtop over a tablesaw

I made the base by laminating two layers of 3/4" MDF. You can also use plywood. I sized the base 6" wider and deeper than the tablesaw surface, including the fence rails. Next, I cut grooves for the T-track using a handheld router with an edge guide. While installing the captured T-track, I made sure to allow space at each end for the insertion of T-track bolts and other accessories.

For the handholds, I drilled out each end, then cut out the remainder with a jigsaw. Add as many dogholes as you need to allow for additional clamping options. Finally, I glued and pocket-screwed cleats on the bottom to fit snugly over the tablesaw.