I've compared the schematic and the layout the old fashioned way. I printed them both I also checked out the original SLO schematic. I found some differences: 1) The stage between the cold clipper and the cathode follower has a 220k plate resistor in the original. 2) That same stage has a 1uF bypass capacitor which is missing in the layout 3) The choke is current rating is 150mA on the schematic; on the layout it is 125mA. 4) You removed the stage after the fx loop. This stage consists of a DCCF. Merlin somewhere says that the DCCF is very important for the overdriven sound. In his book he specifically mentions the SLO100 having two such circuits cascaded. I've never played a SLO100 and don't have much amplifier experience at all, but based on Merlin's remarks I would say you might change the tone of the SLO by removing the second DCCF.