Something from my country Official site where can we support them: http://www.indiegogo.com/projects/g6-driving-simulator
Interesting, very interesting. But practically all players have their sound system and dont want another. If you make a really cheaper system you will shell thousands of units. A good comparison is G25 vs ECCI... Good luck!
Have done a few tests with head motion and came to the conclusion that I really didn't like having my head tied, Perhaps using bungie cords tensioned would be a bit better, full body motion is my preference
Ive been planning on building this type of motion for a long tine. Like adrian i feel elastic ropes might be better,maybe not as accurate but more confortable