Sorry to ping this thread again about the same topic. I figured out most of the dimensions I need for the plate, but there is one left: the plate thickness. Other brass plates I have are 1.5mm, so I'm guessing that might be right, but I don't know how much room there is for error in a gasket mounted system and I don't want to order something and later find it doesn't fit! The other options I'm given (by laser boost) are 1.2mm or 3mm (which I assume is way too thick). Sendcutsend offers 1.6mm, which I'd hope is close enough to 1.5mm as to be equivalent.
I could, of course, wait for my sagittarius to arrive and measure the thickness of the plate, but if you could let me know the thickness of the one that comes with the sagittarius ahead of time it would allow me to get everything together ready for when the keyboard itself arrives :-)
Thanks for the help, sorry to have to keep banging on about the plate!