It seems that my Gmax fuselage and firewall are both showing up as see through. It may be 2 separate problems, I can't tell and have tried a lot of flipping things, but am new at this and can't get it right (although it looks cool). If I copy the model to *_interior.mdl for the Virtual Cockpit view it looks okay sitting inside looking out.Can someone tell me or is anyone interested in taking the fuselage and getting it to look right in FSX ?Hollow Fuselage:Notice the firewall is see-through also:

Turns out it is the Mirror Tool used to add the second half of the fuselage, instead of using the Mirror Modifer in the stack.To fix, delete the added half, mirror and clone the first half, mirror modify the cloned part, and then join the two halfs.(Thanks to Bill)