If anyone can use this, here is an AutoCAD drawing I drew up to have my plates cut at the waterjet guy.
The diameter of the plate is 3.90" for the inside diameter of 4" type K copper pipe
Downcomer hole is .875" for 3/4" downcomer
perforations are .0625" on a 4.5mm grid
centre hole is .247" for 1/4" stainless allthread
I can adjust the diameter of the plate if someone needs a different size for different wall thicknesses or if you need a 1/2" downcomer, just let me know
I GUESS IT WONT LET ME UPLOAD A DWG FILE
PM me if you need one