Hi there,
That sounds similar to a project I worked on with the BBC this year, using HC05 and HC06 bluetooth modules combined with an Arduino-compatible circuit, and prototyped alongside an Android app for the front-end and uplink...
Might well be worth me having a chat with the project owner, even if just to help them orient and specify their needs for a different developer, given we've been around the block a bit on this kind of design. It's gone a way beyond what is reported on the BBC R&D blog, now.
Incidentally I also have a workshop full of 30each of I2C accelerometers, gyroscopes, Compasses and 10dof modules combining all three. These could well be handy for prototyping.
Cefn