Well, the only thing I have to criticize is the spike bricks. Use cones instead to give it a more blocky look.
Otherwise, impressive job. Does the silo have an expanding roof?
NINJAEDIT:really nice spam idiot.
1.Well i use spike bricks cause there is no up-side-down cone brick so thats why i use them.
2.Well it has a "hole" in the roof but no moving doors up there, good suggestion anyway.
Thx guys for all the good feedback!