Got the driver board today. It turns out I made a mistake and left out one hole next to each 7221. To work around it I had to install these resistors on the back of the board.
The top and bottom fit together perfectly, until I added the chips to the sockets, then I ran into clearance issues with the tops of the chips hitting the long legs of the led bargraphs coming thru the top board.
So I'm going in with snippers to each leg but might be doing some damage since everything is all soldered-up. I will go back and reheat the joints and hopefully that will be enough. If not I have another led board and more bargraphs on the way.
Made progress with the Max programming last night. Got some great tips from Kid Sputnik and as a result was able to get the stribe strips to generate OSC messages, which actually show up in Reaktor! Now I have to do something with the messages - time to dig back into Reaktor programming.