a) Nostromo Lander - Owl design (1978) for Alien by Ron Cobb
b) 'The Snap-dragon-fly' for Lewis Carroll's Alice Through The Looking Glass (1871) by John Tenniel?
c) One above the other
c) Leaf on the far left becomes the rear thruser
d) he main body of the insect becomes the upper part of the Nostrom owl lander