Quoted from adol75:The size of it is clearly an issue and the fact that you can't put it against a wall which can be problematic in many locations.
Since you need to send balls between machine, have you consider making that "virtual" ? As in ball lock on both sides, put 10 balls in each, and release on one playfield while locking on the other playfield. That way you keep your concept intact and you can link machines side by side, and eventually be able to sell a single machine, same way it works on linked arcades.
And pushing the concept further, you can add more players to the game, make it a 4 player one etc...
This is an excellent idea, as it would address the size/space issue. You could then set it up with a single-player ruleset also, and thereby get in more plays on location from individuals who don't have someone to play with.