Custom built 4 seat rail for logging roads, pedal question....

[Xerophobic]

Hey all, newbie here getting close to finishing up a build thats been going on for about 3 years! Wanted a short wheelbase 4 seater for camping and exploring logging roads so made myself a powered bender and made a frame, turned out better than I expected and i get it back from powdercoaters this week so im pretty excited.

Anyway ive been collecting parts for a few years and have almost everything i need except a pedal assembly. The chassis is designed to allow the rear suspension to be removed because my first donor was swing axle and figured i may want to go IRS. Anyway its going to start out with 4 wheel drum brakes but of course I may upgrade down the road.

Any suggestions as to what size clutch/brake cylinders i likely want to look at? and is it possible to have something that can work well for drums now and possibly disk later?

Thanks in advance Im super excited to get this thing done finally!

awaiting the fire engine red........