The bike you show is listed at 1600 Brazilian Reals which translates to $427 in US currency. There are not a lot of two wheeled recumbents available at that price here with the exception of some real dogs. The 16 speed (2 X 8) suggests it is an older recumbent bike because most builders started using 2 X 9 or 3 X 9 a long time ago. I still think you would get a more stable handling bike by buying one than by building your own.