These are the headstock supports and lower headstock cap, showing their
relationship. The holes in the headstock cap aren't drilled yet,
but you can see how it will sit at the top of the supports, and how the
holes will match up when these parts are glued together. Once this
set of parts is assembled (two sets, one for each headstock support) I
can use it to transfer the hole positions to the baseplate and drill the
matching holes, followed by counterboring and crushing the nuts into the
bottom of the baseplate. The bed risers and ways will be flush against
the surface of one headstock support, and I may decide I need a reinforcement
support between the headstock supports as well -- that can be added before
line boring for the spindle, or even afterward without requiring tedious
realignment by simply withdrawing the spindle from the bearings and sheave.