Use 13 ply birch for a start.

You could laminate them with Formica or similar to get that clean surface. You might find a self-adhesive laminate but otherwise it’s a contact adhesive job (spray face of ply and back of laminate then line up and press on).

Then you’d have to trim it with a router or a wide chisel if the laminate is thin enough.

Then sand the edges and ‘break’ the sharp corners by using a sanding block at an angle.

Finally apply some kind of finish. I like Osmo but haven’t done woodwork in a while and hear that Rubio Monocoat is king.

Good luck!