Thanks! This was our first project like this.
for anyone interested in trying such a project: The wood is impregnated with a stabilizing resin already. Not strictly necessary for a hardwood, but it should help with not warping/cracking. Thats more of a problem for western handle scales pulling away from the tang then on wa handles. Fit the wood into the horn with a mortise and tenon joint, then epoxied. To make it shiny, we took it up through 1500 grit sandpaper, then a finished with linseed and beeswax. The blade is burn fit in so I have the option of moving it to another knife eventually. I might use hide glue, which is reversible too, using moisture and heat.
It just feels more solid and heavier than the burnt chestnut D shaped handle I replaced. Burnt chestnut varies in quality I guess, because the octagonal ones from JKI , I like a lot.