It seems that, the 8th of inch difference doesn’t effect the edge to edge coverage of the plate, however my 1st test, using using the alpha 4×5 model it did basically work except that my dark slide apparently isn’t as opaque as it visually appears, however for this model that’s ok in that the final materials haven’t been decided on, for the next model, I have to make some adjustments, and will likely use an original dark slid, at least until I can replace it with the correct materials.

as labeled this is an alpha version I’m still resolving some of the details.