Carved a pocket for the inlay in the first piece the female part, then did a mirror copy the male part to inlay in the first piece.
Used the same tools you would use to do inlay in wood.
I used Rapid Fuse A DAP product to glue the two parts together it sets in 30 seconds so be ready to work quickly, I built a press to put the two
parts together with a small amount of pressure, make sure to press evenly so the inlay dos not shift and leave a gap on one side (done that) it sucks.
Check the forum on inlay techniques there is some really good information out there hope I helped a little