A reply to the comment on the last post. The perforated plywood piece is a sort of ‘adapter plate’ or ‘connecting plate’ used to attach things to the front. As you can see the plate bolts to the tap frame and the numerous holes can be used for screws to fasten things there. These screws would be facing pointed side out and would first fasten whatever cross pieces are needed to the plate which would then be bolted in place. Easier shown than described.
Scrap pieces have been screwed in place so that press blanks can be clamped using a rectangular piece of plywood and wing nuts. You can see those parts in the “Using the Tap” post.