Yesterday the small screws I have been waiting for finally arrived. So today I could proceed with installing the new motor. Now I have glued the rails for the motor mount in place and reinforced it using Stabilit express. The next thing will be to completely remove the mount and put some lacquer on the rails. Then the motor can go back in.
Then the ESC will need to be re-programmed for 6S LiPo and the water cooling should be installed properly. After that the Slo-mo should be ready for new trials.
Here are some pictures: