table top...where to start

I’ve got some old timber that I salvaged. It was a roof of a chicken coop, I think. Some of it is quite solid, other boards are quite rotted. Wife wants a rustic dining table. I was thinking of a trestle table design.

How thick should a dining table top be?

These boards are about an inch thick right now. I was thinking of running one face through the planer, and two edges over the jointer, then glue up a big panel. The patina face would face up and the planed face would be down. But with all that planing, the top would be getting a lot less substantial.

If it were too thin, I was thinking I could put it on top of a plywood or particle board panel cut to the same size. Then glue returns on the end and sides to hide the particle board. Or maybe a different design of table (w/ 4 legs) would support a thinner top better.

Dunno. Kind of stuck. any thoughts or suggestions on my above ramblings would be appreciated.

RickB