Took gearbox and all plates out.
Did another dry run with plates only before final fit.
My engine mounting sequence (gearbox not fitted) Note. Only tighten the 2 dynamo and 2 lower motor plate bolts. Then slack fit remaining bolts until gearbox is in position.
1 Fit dynamo’s plates to front of motor unit.
2. Rest a 25mm piece of wood on the frame to protect frame.
3. Lift motor unit into frame then rock motor unit forward and fit dynamo plates to the frame then remove piece of wood.
4. Fit lower motor plates with 2 bolts only. (Both offset engine plates are fitted to LHS of the frame)
5. Fit LHS gearbox plate. Then the gearbox. Then the RHS gearbox plate which can be a bit fiddly to get in position.
See photos