Looks fun! I've got a big cat with a CMB 90 in it, mine is a 48" Orion from Prestwich Models.
Couple of bits on mine which you might need to do on yours (I don't mean any of this to come off as condescending, just sharing what I learned with setting up mine, thats all)
- Mine wouldn't turn with a 2 blade prop, 3 blade all the way
- Get some air intake on the front with vents on the back for it to exhaust. The 90s can get hot especially when run lean, so I'd recommend the airflow
- I'd recommend a Prestwich models tune pipe. They go so well with these CMBs
- I didn't put the fuel tanks far enough forward so I had to add some weight to the front of mine as the nose just wanted to go up in the air no matter what I did with the prop. With the tanks further forward it will sit more flat like a cat should and handling will be spot on.
I think thats it otherwise, enjoy it!