20lbs is pretty light for a seat that is supported by a base, but it's not that hard to do. I think OMP seats are the cheapest FIA approved seats and the fiberglass ones come in at 23lbs. The carbon fiber ones come in under 15.
I still wish more companies would do the cushion on frame seat, I find all the adjustability in fancy new cars to be pretty silly. The most comfortable position is where you're leaned back a good amount, the knees are pointed slightly upward, and you can reach the pedals and wheel comfortably. The LaFerrari does this with moving pedal box, and I think the Ford GT has a normal bucket seat bolted straight in with moving pedal box (the rear of the seat is probably hooked into the roll cage I'm guessing so it's not dead weight).
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