Looks great so far, you are definitely doing this the hardest, and probably most fulfilling, way possible. I would suggest that when you set your pins that you spin them in a drill and use the sharp edge of a file to cut some rings in them to retain some epoxy. Since the original epoxy has fully cured the new stuff will not permeate the old and the pins will be slightly less than 100% effective.
I use a fixture to stack the scales will the pre-drilled blade on top and drill my pin holes through everything at once and when you epoxy everything at the same time, you get a monolithic bond where everything is supportive. If you choose to put your pins in afterward because of the hand rasping I would use a stepped Corby or Loveless style bolt to secure the scales.
Other than that, you should be commended for your hard work and great WIP.