MiniCar4 was the same as minicar3 but placed not on the brick grid and the trees i would fix but i can't because i did not save them when i exported them. (the reason why they have missing faces was because i upgraded blender from 2.65 to 2.69 and for some reason on all the faces on the cylinder deleted the front and back faces. it did it on the plane faces but i fixed that because i saved the .dts)
What's up with the window? you made no sense about it to me?
I don't make icons on my bricks anymore because i don't normally release them and plus it takes some time
At least fix the names then.
If you just made some bricks and exported them without even saving that means they weren't a hassle and you could do them again. Also .dts??
If you cover faces of bricks normally they are actually hidden behind as well. For instance if you put 2 1x1s bricks next to each other the 2 faces that would be in the same spot will actually not be there anymore - you can F8 in there to see for yourself. For your windows you have no coverage so they don't disappear.