I would assume that the Lancair could be built to accommodate large pilots and passengers.  One thing that I really love about my Glasair I is that it was built with large pilots and passengers in mind.  I am 5'10" and about 175lbs and I have to fly with a seatback cushion that is about 4" thick.  It is upholstered to match the leather interior.  It also serves to keep the pilot and passenger from butting shoulders during the flight, due to the passenger being slightly rear of the pilot.  My flight instructor is about 6"5 and at least 250lbs, and flies with me with no problems.  Another nice thing is when it's time for the thrill ride,  I can don my parachute and toss the cushion and be perfectly seated.

Steve