Grigg,
I got the clutch/ brake mc combo along with a mount bracket and pedals in a kit from an aftermarket company for less than $300. It looks great and I think I will like it better than imagineering the linkage under the floor. Things are a long way from stock under there with the transmission support under the rear of it now rather than right behind the engine. I hope I don't think of you some night beside the road with a flashlight in my teeth wondering why my clutch won't disengage!
Also, based on some advice you recently gave another bolter regarding the two speed, I am using the 5 speed with overdrive. I don't yet know the ratio of 5th gear, but it should be sufficient for 55 mph at less than 3000 rpm.