@Pauls_Plymouth: thanks for the questions
We used the 15" hoses, but we also moved the connectors to the opposite side of the suspension. Honestly with where they connect, I think the 17" would be fine too. One side can touch the suspension with the steering wheel lockek but during normal turning while driving it has plenty of space.
Yes, we're using the stock brake pedal, connections, pivots, springs, etc. with how I mounted the new master cylinder. I don't think that the hunk of metal is worth $35, but we don't have the capability to make anything like it and it was very easy to work with -- so, for us, money well spent.
I've managed to drive all 4 of our vehicles this week and I think our 1950 Plymouth compares nicely.
1950 P20: braking happens as soon as you touch the pedal and has a reasonably short throw. Not touchy, doesn't just swap from slowing to stopping. Doesn't require much pressure compared to before our Scarebird conversion The only 'non-power' breaks of our vehicles
2003 VW New Beatle: lots of free play before slowing. Even application once it kicks in
2014 Toyota Prius V (wagon) this is a hybrid car and the only 'automatic' here at home. A light light pressure on the brake pedal just kicks in the regenerative generators. Press further and the actual brakes kick in and they are very grabby / touchy. Have to be careful. This is the heaviest of the 4 vehicles we have here.
2016 Mazda 3. Long pedal travel but really good stopping. A little touchy on the pedals however.