Advice needed on Limits...

I'm not gonna stare at them, you could make a simple excel spreadsheet & put everything in total it up easy enough.

I've spent the last few hours trying to find out why some MAX7219's were not driving a display - finally dawned on me that power & ground had only gone to 1 of 4 chips. Must have got distracted at some point & stopped wirewrapping 6 wires too early...