I wanted to have the bike illustrate a more raw look. The padding on the saddle would restrict that. I took it off because I find that a powdercoated seatpan looks way cooler with the rest of the bike, of which you pretty much only see metal.
@Fredzzz: why don't you use "Inventor", it has been realized on purpose for mechanical parts design. But, anyway, on this forum we realize the reinforced clutches. I'm anxious for the brake adaptor, is it different from the Sprocatti's one?