A lot of good information above! Many thanks!!
The concept I am going with is to apply the hardwood edging all around the edge of the table. Using a router, provide a smooth transition from MDF to the edging. Then apply laminate, top and bottom, covering the MDF and top and bottom of the edging. Finally, with a chamfer bit, finish the top and bottom edges of the table top.
My motives for hardwood edging are (1) provide better esthetics, (2) provide edges for sleds to run along, and (3) provide something better than MDF to screw attachments into.
My biggest concern with the grooving and rabbetting is whether differeinces in expansion (MDF vs hardwood) becomes a significant problem.
And no Bob, I don't intend driving a car over it!