1) Two slabs of wood remove enough wood the blade is a snug fit and glue together.
2) two slabs of wood with a layer or three of spacer material shaped to the knife profile and all glued together.
Belt loop attachments can be done in any variety of ways, let your imagination run wild.
Block of hardwood shaped to be the belt loop
Sheath has a recess carved for the leather and a leather loop attached to the back like a conventional leather sheath. Forming and sewing wrap around portion done while wet so it shrinks tight.
Stabilized maple burl and ebony, boar is carved ebony and family name is dyed epoxy in a groove