This is the most challenging box that I have made, and I am glad I pushed myself to get to this stage. The next retiree won't be so lucky.
I lathered BLO on the spalted Maple prior to assembly to allow it to absorb as much as it could before I assembled the box initially. I put 2-3 coats each day for 3 days, and it was still soaking the BLO up. The box bottom (above the drawer) is myrtle wood that I sanded down to about 1/8" thick. Planning Myrtle wood can be hazardous as it has a tendency to tear, so I always finish the last 1/8-1/16" with a drum sander. I also wetted the outside surface of the Myrtle wood with water, then finished sanded it to 240 grit. The inside I sanded only to 150 grit.
Here are some additional pictures taken last night before I wrapped it up.
This final set of pictures is with a finish called Doctor's Workshop, that is a combination of Walnut Oil, Carnauba Wax and Shellac. I brushed it on and wiped off the excess.
Enjoy, and be careful of the splinters.