Agree a screenshot would help. You should be able to see on the 3d pane what the components look like before simulating the toolpaths. If they don't look like you want there, they won't look any different after creating toolpaths. It should be possible to position and change the heights, tilts, fades and combine modes of the components so that the landing gear appears to be under the wing, but we'd need to see it to give you specific advice.
D&S Artistic Woodworking http://www.dsartisticwood.com