http://www.oople.com/forums/showthread.php?t=18900
I guess the LRP TC Spec is about the same as you speedo.
Have a look how I did it and you might get some ideas. I have a carbon plate on which I tape my speedo and it is attached to the main chassis by just one screw. Just undo the screw and you get great access to the motor mount screws.
I did some minor rewiring (brushless measurement wire together with the power wires) but my electrics setup hasn't changed since.
Good luck....