Okay then, I guess it stays a single board!
One way or another we'll make it work.
I'll post a PDF later with the current layout. I want to draw some ratlines on it first to show you guys the major nets that need to be connected.
Another thing I was thinking is, currently I've got a 16 position terminal block for the Paddle 1/Paddle 2 Inputs and the Rotary Switch connections, however I could split it up and decrease it to 9 positions by making the user wire some of the connections together at the switch instead of doing it on board.
By this I mean, P1/P2 selection is done with a DP4T rotary switch which, for example, has Ball-Y fed to connections 1&3 of Pole 1 and 1&2 of Pole 2. Right now I simply have a terminal block with 10 connections so the user can wire the switch straight into the board and I take care of making sure Ball-Y gets to the correct switch terminals, however it would be a lot easier on me if I could have a single terminal block with a Ball-Y output and let the user jump terminals P1.1, P1.3, P2.1 & P2.2 together with wire and run the Ball-Y connection to one of them. Make sense?
In this case I would have a single +15V and -15V connection (right now there's two of each, one for each paddle but they could obviously be shared). Then I'd have an input for each paddle which goes through the RC network, an output for each paddle and Ball-Y, which goes to the rotary switch, and finally an input from the common on both poles of the rotary switch.
This would actually give me quite a bit of freedom to re-arrange things, as I could put several of the terminal blocks in different locations, so I don't have to run some of the traces halfway across the board.