Sorry, I just cant agree

They are both ugly as hell, look and play worse than the cheapie store bought ones.
As for moving the legos arround.. it seems at least one of them has a smooth playfeild. If that is so, then they must have had to use non legos for that? And glued legos to it.
But even if not.. who cares if its hooked to vpinball... if it stinks, it will still stink with vpinball connection. No coils, no amazing lightshow, only a few rollover switches, no flahsers, no electronic flippers? (leads to momentum cheating),
no illuminated inserts.. and no real theme or artwork. And nothing you build with it will ever resemble any real machine in vpinball... not even close.
Making a real good pinball machine is an artform for sure. It will take many fixes and tweaks.. but hell, thats the fun challenge : )
When you do make a tester board, you could in fact make a setup with one of those holed boards used for hanging tools. Place parts on it, then make a smooth thin overlay to cover the holes so the ball moves without problem.
Or, just use a piece of wood, screw the parts in from the bottom. If they need to move, unscrew them, move, and redrill and screw in a new place. You could fill in the dril hole if needed... but I think that youd want to redrill the entire feild once you know the perfect locations on a fresh board.
Heck, I think someone could make a better cardboard pin than these projects posted

heh
I once made a near lifesize skeeball machine out of cardboard when i was a kid. Used tennis balls, and even had a ball return : ) No score board of course : ) heh Played awesome actually.