Hi Rick,
I live in the Houston area and building a B model. My wings are nearly complete but I have not yet built the fuselage. I'm 6'5" and sat with my son in the factory demonstrator before I bought it. I'll probably use an in-ear headset rather than over-the-head so I can keep some clearance and not worry about scratching up the inside of the canopy. Shoulder room is tight with two people but that's a compromise many large pilots live with. I don't mind a snug fit but I bet other large guys will have a different opinion.
I don't remember any issues with knee room and pedal distances, but I haven't flown a B-model, just sat in one. Kerry from the factory says he's 6'0" with 34 inseam. That's the same inseam as me and here is a link to a photo that Kerry posted showing how much knee room he has in the factory B-model.
https://www.sonexaircraft.com/images/Le ... -Model.jpgPaul