cRetCode = Can0.begin(lBaudrate, ENABLE_PIN_CAN0);
As I have many times mentioned on this list I prefer at least Teensy 3.2. It draws only 90 mA current.But before goint to hw, it is best to have some kind of idea about the goal. Either you did not mention what your IMU sends.
One company has started to make Teensy based sensor boards for NMEA2000. They contacted me due to my library and send me some sample boards. There is one nice ready IMU board. I can ask are they ready to sell.
You can get reasonable GPS compass in about 1000 € or spent 50-100 hours with IMU:s.