Quoted from SpaceGhost:Yeah. I'm going to manually add the flippers. I didn't exactly know how big the holes should be and what distance I wanted to use yet. I have a laser cutter and will make an overlay template to position the holes once I figure that out.
On my stuff, which is mostly Pinball 2000 (but pretty standard dimensions), I drill the holes at 0.5" for flipper bushings to fit through. The holes on Wizard Blocks for the flippers are about 6.657" from center to center.
I use 03-7568 for the bushings: http://www.pinballlife.com/index.php?p=product&id=270
Looking forward to seeing more!