This pedal in FlightSim is too ugly, and the use of pulleys is anti-KISS.
Look at plans for Baloo Pedal:
Build in parallelogram principle like most of commercial pedals: Simped, VKB, GS, discontinued TM RCS.
Animated .GIF of VKB pedal.
Look at Simped drawings, is very similar:http://www.dhs-electronic.de/img/produkte/6_f16c_voll.jpg
The spring system to center pedal is similar to one used in above pedals too.
The only part in Baloo Pedal difficult do make is the foot rest, since original was built in metal by laser cut - JFA build one using manual methods, see in relative thread.
Simply adjust this part to material, ie. Alluminium, MDF, Plywood, Plastic... and tools available.
Similar project build with PVC tube and joints, bearings:http://www.sukhoi.ru/forum/showthread.php?t=38242
I'm not saying that this project is the best available, but it is practical to build.
For cheap USB controller, search for Logitech
Attack 3 joystick, that have just 3 axis.