1Constructing the NAND gates.
First, construct 60 NAND gates, following the given schematic and picture. I did this by cutting out 6x6 hole pieces of prototyping pcb board, and soldering all the components in according to the gate schematic. I then connected MALE pin connectors to the bottom of the gate. This way you can solder all the gates into the board to be connected in the following step. Make sure to test every single gate according to a NAND truth table, BEFORE you solder them onto the board, this will save a lot of headache trouble shooting in the future.
2Assemble the board.
This is the hardest part of the project. You just have to run the simulations in logisim, and test all the connections with a multimeter. As you can tell from the pictures, I had to jack in some more gates after some of gates I soldered in went bad.
Once the boards are all wired up and working well. You can attach it to your own I/O boards such as switches and LEDs in order to provide an interface for the adder. Your all done!