heh, that explains part of the high poly count :p
you have a lot of flat surfaces with a lot of rings on them, you could consider hitting delete edge on most of those rings on the flat surfaces
(shift+ctrl+click (i remembered you're on a mac this time!) while in edge selection mode and the option is on the menu, or its somewhere in the menus at the top)

most of those edges don't add any more detail to the mesh and they would make laying out the UVs a lot more annoying...unless you used a UV layout tool, the free one is Roadkill

unless of course you plan on adding bumps by deforming the mesh itself then it's fine

either way, i still think your screws on the bottom cap are awesome


i'm really curious to know.... how did you make the caps?