This is a slightly prettier picture of just the board, with a US quarter dollar, anda 6 inch ruler. The board's outer dimensions are roughly 8.5 x 11 inches, or about the size of a sheet of paper - pretty big, but not unheard of for a PCB (printed cricuit board).
You'll noticed that I placed all the digital stuff, the FPGA, the clock, and the ADCs close together near the middle and the left of the board, to prevent them from disturbing the analog signals. Similarly, I put all the high power items along the top or left edge, so they were even farther away from the analog circuits. I put all of the analog circuitry in the lower right of this picture.