Route top contour from nice hardwood using t_inlay_m_contour_feed35_fin25_no_ramp.nc. Make sure contour material is held down with double sided tape around the routing area. It will break free and destroy the inlay otherwise.
Once contour is cut, carefully place in pocket. Use spare 2×4 to fully seat by hammering from top, evenly across the inlay surface until inlay is flush with top.
Tape top and bottom pieces together.
Drill 1/2" hole for dowel. Cut dowel to length (~2") and install. Glue dowel to top, let bottom slide freely.
Sand dowel flush with top and bottom.
Using outline cut, trim top and bottom to size using jig saw or band saw.