Identical for upper and lower guides
below the surface of the błock.
Guide blocks. Use the hardest wood you have, I bought some exotic Bocotoe offcuts for $1 for minę.
Countersink for You may have to chamfer drywall screws a corner off the lower guide błock mounts to elear the ta be.
Lower right side guide błock needs a corner cut off to not hit the table when its tilted 45 degrees, Alternately, carve a cavity into the bottom of the table to elear the błock.