Having just successfully built my SBC 2.3, I would like to make a few comments.
1) Thanks to Daryl for designing a great little board and producing from very nice PCBs.
2) I had two slight problems with my completed board. The first of these was that the 6551 clock crystal was not oscillating. I had built the board with a 33pF capacitor as being the closest to 30pF that I had to hand. On Daryl's suggestion I changed this to 22pF and the clock started running. The second problem is entirely due to laziness on my behalf which resulted in not getting a clean reset so the CPU was not starting.
3) For information, I'm using a W65C02 and a 6551 with a manufacturing code of 8409!
Again, I would like to express my thanks to Daryl for both producing the PCBs and for the help in getting it going.