After a few evenings I have my chassis assembled tight.
I milled square, two pieces of engraving brass – 5″ x 6 3/8″.
I found the centre datum line and ‘registered’ the plates together using small taper pins.
The pillars are 3″ long and have a spigot both ends.
One spigot gets faced off for a 4 B.A tapped hole, the other gets rounded off for ‘quick release’ taper pins. Each pillar is made for each hole respectively, I give a small, hidden mark to signify pillars l, ll, lll, and lV.
Spot through the plates with a centre bit then clamp it all down real tight to stop it grabbing as the pillar-drill pops through.
I’ve made rings to decorate the pillars.
I made the steel screws and brass washers.