1&2. No. I do it all in one. I measure and cut my pillars. (Put everything together and check function. Sometimes a pillar is a little long.) Then I lock them to the bottom of the waxed action with bolts. I’ll spread my bedding compound in the stock, the holes and coat the pillars. Set the barreled action in the stock, press it in and check for level. Leave it overnight.
3. Exactly! The shims under the forend are making it level as clamped. It leaves room to slip in the barreled action.
4. I buy the aluminum pillar blanks 10 pair at a time. I cut them to length on my miter saw using a homemade fixture. Tape wrapped around the bolts keeps the pillar centered. I drill a 5/8” hole for the 9/16” pillars leaving room for the epoxy bedding. Gotta spread bedding in the holes and goop up the pillars. In the morning, I unscrew the bolts and drill out the extra epoxy with a 5/8” Forstner bit, careful not to hit the pillar.
Trade secret: I put a steel washer on the bottom of the pillar before I lock it to the action. The Forstner bit will hit the steel washer and spin it loose, leaving the pillar undamaged.
Plenty of room to cover the pillar in the rear.
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Not leaving yet!