Sketchup to UE4, engine doesnt show some of the faces

[anonymous_user_464b178e]

Here’s what my model looks like in sketchup 14 pro.

and here’s what the model looks like in Maya:

and finally, UE:

Does anybody have a clue as to what might be happening?
Tks in advance,

[anonymous_user_464b178e]

nvm figured I had the faces inside out, hence the engine wouldnt show them