Finland File Knife Blade

I made this from an old file from finland. I grinded it with an belt grinder. I brought the blade portion up past the magnetic point while leaving the ricasso and the shaft relatively cool.and then quenched it in oil. I mirror polished it by bringing up the grit from 80,120,220,400,1200 and polishing compound. i cut the right angles on the bottom to accept where i will be putting a brass cross guard and a hickory handle. i hope to get the brass soon and work on it shortly. i will pin the rattail in the handle. Does anyone have advice on the best way to do this with what i have so far?