I currently have a Majestic MBU 36 pre-fab insert that has no doors or screen......it was left this way in the home we purchased. Are there any viable wood burning inserts I can use with such a setup or am i better off removing the entire unit and starting from scratch? I have read a number of threads/articles and it seems that either way is a possibility. My wife would like it to be more of a flush mount system for the clean look.......I am looking at efficiency. We have a 2500 sq ft colonial.