Superduty master update:
I actually ended up going with a plate to rotate the master relative to the booster to get it to package how I wanted. Lots of ways to do that, but I got 3/8" of plate and welded some nuts where the master would clock to, and then the booster side was retained with its normal studs. This is a bit more elegant too than the previous method I outlined earlier.
With the position I clocked the master I had to remove the reservoir which is absolutely huge. It would be really easy to make a new reservoir since a large barbed fitting (I think I had some 1/2" or 5/8" ones that seemed like a perfect fit) can slide right into the rubber grommet on the master feed ports. However as a temporary solution I just flipped the reservoir 180deg and then it cleared the big plug which was my clearance issue. There's a roll pin and two clips (one per side) that hold the reservoir down, and annoyingly the clips are barely off center so don't work if you flip it around. With that said, the reservoir is very firmly held in by the rubber grommet and the plastic barbs going into them. For the time being I just ran a zip tie through the plastic clips that no longer engage anything so the reservoir can't come off vertically.
Onto the good stuff, the brake feel is WAY better. The pushrod off the booster has about 0.75" of motion (out of an available 1.25") before it runs into a wall. I'm not sure what's going on, my wife said the wall would disappear only when we were bleeding the front brakes. In practice you get pretty good braking up to the wall, and then if you really push on it there is more to be had but you really have to shove on it. This is in stark contrast to the car master which had effectively no feel and you could bottom it out very easily.
My brake pedal ratio is around 4:1 currently, braided lines the whole way, no proportioning valve.
Overall it feels a lot better, though I must admit I expected it to be easier to lock up the brakes. The car master would lock the tires up in a discomfortingly easy manner, where as this will also lock them up but requires a lot more effort to do that. The braking zone before lockup feels great, and lockup I wouldn't say is hard, but a kid for example couldn't lock the tires up where as they could with the car master no doubt. I've only done one test drive for ~30 miles, but I like it a lot, and even though it requires a bit more effort than expected to lock up the brakes the flip side is it's a noticeable force increase required to do it so it doesn't sneak up on you. For going fast I like that, for crawling I could see a higher pedal ratio being nice to not have to work so hard, we'll see if I continue that philosophy once I get it out in Sand Hollow.