Hi,
I'm very experienced hardware design engineer, working currently for a big international company as a lead hardware engineer.
I can deliver all you need.
1- HW design for (Bluetooth, GSM/GPRS, GPS, Accelerometer, battery, PIC).
2- Firmware.
3- Mechanical design (case and cooling), and all needed manufacturing documents.
4- Tested prototypes
I have an experience with GPS, GSM applications based on different platforms and your project seem to be another similar one.
Please let me know if you will need some more details.
Best Regards,
Michal