My first comment is: "don't". I fitted Savage switches a few years ago and they haven't worn well. The symbols have dropped off a couple of them - easy enough to glue back on but not ideal. I also had the problem you are facing with 2 position switches. Caterham use a custom circuit board to control all this and when I was looking it was over £300. In the end I compromised and had separate toggle switches for wiper speed and heater fan speed. I have a headlight on/off switch (latching), a main beam switch (latching) and a main-beam flash (momentary). You'll probably need some additional relays since the Savage switches won't take the current that some of the standard ones do. Since that project I've ditched the windscreen so have a load of redundant switches which I need to tidy up some time. If I ever re-do the dash properly, I'll probably ditch the Savage switches and use some good quality toggles in a layout more like the 620R. You can get 3 position toggles for the headlights, etc. Cutting the carbon was easy enough - I used a step drill to make the switch holes and a dremel type tool to cut any larger holes such as for the Stack dash. I covered the entire dash with masking tape and drew out my design before cutting and drilling. It looked pretty good when I first did it but in hindsight I wouldn't have bothered. If you find a solution to the toggling switches then it should keep the switch count down and make the dash a bit neater than mine ended up. Keep us posted on how you get on.