You are going to find after opening up your shell that you don't have a lot of room to put stuff under the motor. The motor also has to be free to turn. Look up Bondic. you can get it on amazon. It doesn't set up until you apply UV light. I'm going to experiment with cotton balls. I plan on laying down some bondic. putting cotton down and pushing it into the bondic. Once the cotton absorbs the bondic, apply the UV light. Bonbic has some videos.
I ordered from Bonic website last friday and they hadn't shipped it today, so I cancelled my order and got it off amazon prime cheaper and shipped free. Will be here on Thursday. The bondic will be very easy to spread around the base of the shell supports. Where most of the cracking starts. Once it's all applied and you are happy, then shine the light on it. I also plan on putting it around the 4 screw holes for the motor mount and on the base between those 4 holes inside the shell. Problem with CA glue is that it eventually cracks and delaminates. I think the bondic is going to be a winner. 22 bucks on amazon, why not try it on something. Worth having around the house for plastic repairs if you don't end up using it. No. I don't work for them.