newbee moelling abbey spectrum 418 caravan wip

I am quite new to modeling and texturing.

Hopefully I have done a ok job on the wheels?

Please let me know.

To be honest I kinda jumped in at the deep end, I love blender and with the thanks of cg cookie have learned so much.

The model is of a abbey spectum 1992 issue.

To be honest im kinda learning as i go.

So

What mistakes have I made???

here is the link: https://dl.dropboxusercontent.com/u/150707256/blender/abbey%20spectrum%20wip.blend