Just curious... I've seen some people switch out their clutch master cylinders with the s2000's unit. Is there anything to be gain from this?

 

The only people I know of doing this is to 'tuck' the CMC. It deletes the divorced reservoir and hides the CMC better but makes it a bit more harder to service your system.
If you are into 'tucking' then this is the CMC you would use on an Accord.