Finished drilling pilot holes, in the process knocking off ALL of the carefully placed 1/4" washers that achieved damn-all. [sigh]
Opened up forward face to 22mm to admit the 5/8" hole saw, noting a discussion on the email group at the moment that ASS had substituted one useless tool for another on their build list. [sigh]
Started drilling out first pilot hole to 5/8" with holesaw, but it got about half-way through and just stopped cutting. This holesaw is a veteran of the MLG hardpoints, and it didn't owe me anything, but progress not possible without a new holesaw...
Drilling out access holes for holesaw
Why has progress ceased? Because the holesaw has had the snorker...