Thanks for the interest, well the AP master cylinders cost me about £65 each so I would be able to knock off £130 from whatever I decide to market it for.
As far as floor mounted is concerned, that's a completely different setup, I dont think most people would want to alter their cars that much, you'd be talking about clutch, brake and throttle together and I think they are generally used with a hydraulic clutch. I rather steer clear of something that involved, I prefer to make something that simply bolts in place of the standard setup.
Martin