[autoavia]

Chris - I did use your bracing method for the rear motor bracket but I don't think I got the 90 degree braces between the axle brackets and the rear of the chassis positioned quite right so the brace prevented the rear motor bracket from locating in the right place and this moved the motor forward which then fouled on the interior so the body didn't fit. 
Couldn't trim any more off the interior so I lifted the motor mount brace a little which didn't leave enough room for the plastic collar on the endbell to pass through the motor mount so in the end I cut a hole in the centre of the brace which has obviously weakened it but it is better then nothing.
The ideal solution would have been to go back to square one and move the 90 degree braces on the chassis but having worked on this on and off since April I just couldn't face doing that so I will test the car and if the motor mount flexes too much I will strip it all down again.