RE: How to install Engine/ Battery on plane??
Hello Yashung! Yes, I would agree with Gringo. If you don't have too much experience with R/C planes, you wouldn't want ot start out with a H9 1/3 scale Extra 330. It's a very challenging airplane to fly.
Please understand, nobody here would want to discourage you in your desire to fly, but you would have a much better chance of success with a more simple trainer type of plane. And also with the help of a more experienced pilot.
Well, whichever way you go, the best of luck to you!
In answer to your question, you could use either 1/4 or 1/2 inch foam rubber to wrap the R/C equipment. And with luck and regular maintenance, you could be flying your plane for many years- possibly more than 1000 flights! I have a plane that I have been flying for over 10 years- I lost count of the number of flights.
Good luck!