Managed to get to test most of the system this week (only missing part is network and having four players at once). After some minor bug fixes it worked rather nicely with the chair rotation and back pumping. There are a few issues though, most notably the game is too heavy too run at a good frame rate on our available phones. The plan is to try to find the right balance between flow and graphical quality this weekend.
Next steps will include coding new logic for smoother LAN connection and race rules as well as testing with four players.