Okay, that seems to complex for me. I think it is better to leave the motor as is, and buy a new rear motor.
Here you can see the first problem I had, the aluminum fork snapped instantly, just by testing the spin of the motor. The fork tip was made of pressure molded aluminum, weak stuff! So I repaired it, welded on 7mm thick aluminum profile in front of it, sanded down welding and painted it. Looks like new, so I am happy with the repair.
Anyway, the fork is still of aluminum, and the steel pipe tube trough the frame from the fork did not impress me with thickness. So now I am afraid of installing it in front.
However, back to the old bicycle with steel frame and no damper. As you can see I welded in 4mm steel torque bars on both sides, also reduced the motor from 1000W to 750W due to road safety. (Gives me more than enough speed!)
Last picture of the old bike, I have made a battery box with the battery in bottom, and the charger on top. Box is water proof, and you don't have to mess with the charger anymore. (Box has an outside switch, charging plug on/off due to some current was drawn from the battery into the charger)
The good part is that the charger always follows the bike, and I can re-charge in electrical car parking space. The charger produces little heat as it is only 2A, so that is not a problem as the box also have some free space at top.
Also I have installed a key switch for on/off.
So, my setup is now:
750W (15A)
48V
15Ah Lithium, 2A charger
Now I hope to make a 2nd bike with a damper fork, since the roads here are so bad! Meanwhile I just have to take it easy...