I have continued to work on trying to get the grill looking right and have gone through a couple more iterations of plate assembly only to end up dropping the lot back into the jar of acetone.
My current plan is to build an external assembly jig, and to use it to place the plates one at a time without using bits of rod to line up the plates, but to use one end as a register. I have set up a new press to make sure the plates are consistent.

first a match set of curved forms were turned up on the myford the bottom one will function as the register.
The top one will be where the gluing will happen. The brass forms will be coated on the areas that the plates will touch with reg carpenters PVA glue to prevent the CA glue from bonding the plates to the brass. Once all the plates are glued the a soak in isopropyl alcohol will dissolve the PVA for me to add some epoxy on the bottom edge of the plate block. The jig will be set up at an angle so that as each new plate is added it will fall into position and a visual check to ensure the proper alignment and trim if needed before gluing.
Well thats the plan......
Michael