Probably closer to 40 +/-
I'm going to be putting together a North Coast Custom's 3 way -
9 Buttons per side (6, + 3 control) + 2 for flipper's X 2 sides = 22
3rd Control Panel = (6+6+6 control) + 2 for flipper's = 20
Total 42
Wait, a total of 6 flippers on
3 sides.

What are they thinking? Full screen tables (w/o backglass) from the short sides and WS/3:4 tables from the long side?
Seems like either 2 or 4 flippers (left, right, left upper, and right upper) on one side would be a better way to go.
Assuming the flipper buttons are for pinball instead of
Chicken Shift, you might want to include a ball launch button, too.

Scott
P.S. The Paradise links in your original post are broken.