Carrier Problem

A friend of mine sent me a .fsc file for his CFS2 pre WW2 Lexington Carrier. I loaded it into FSDS2.24 and created a .bgl which I loaded into FS2004. It worked and shows where it should just off Long Beach, Ca. Thanks to some great support from this forum I managed to creat a .xml file and compile it with bglcomp.exe (after I learned how to write command lines) and successfully added a hardened carrier deck. I have one problem left to solve before I texture this project; at certain angles a good chunk of the carrier seems to go invisible. The carrier is pointing north and if I view it fron 270 to 360 all but the horizontal surfaces disappear. From 0 to 270 everything shows great. I read a string in this forum some time ago that with FSDS you should be sure to have all axes of the project be at 0 0 0 in FSDS. My project meets that criteria so I would appreciate any other suggestions. Thanks--------Paul