If you prefer a more airy, spaced out tabletop (this works for, say, outdoor dining) you can simply use a few horizontal 2x4s and attach your pallets spaced out on top of them in a perpendicular ...

To build your own dining room booth, you'll need to first select a base for the seat. You can opt for a window bench-style furnishing, or just put a few cushions on top of a sturdy TV console.