737hero

So I recently began making my first aircraft in Plane-maker. Everything was going well until I noticed that objects could be seen through each other. When I applied the texture the problem became worse I can now only see the opposite side of the fuselage texture and not the one I am looking at. The aircrafts landing gear and misc objects and bodies are also visible through. I cannot continue development because this issue persists inside x-plane when flying. It must be some setting please HELP! Below are some pics of the problem with the last one showing the illusion the best: