Hi Michael – I have made the decision to mount one drain cock in the rear most tapped hole in the steam valve chest. These are primarily there for setting up the timing, but should suffice as the cylinders are on a slight angle. Just need to find a good way of routing the relevant connections to the lever, as it is pretty cramped inside the frames. I have also taken into account other peoples comments on the fact that slide valves will lift a bit.
Thanks for your reply. Peter.