Got some more time to work with this tutorial at the weekend. Got to the point where Andy says - "Now I want you to make some gears and a shaft for this and...". Whoa! I'm on my own now
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Anyway spent most of the weekend working on the gun support and adding some details on the body.
Had a real problem mirroring the rivets. Did the left side but couldn't get the right hand side to mirror over without doing a weird scale. Eventually gave up and decided just to mirror the base items and instance again. Selected the first one and well, blow me, if it didn't go and perfectly mirror the lot, including all the instances
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So the secret was not to try and mirror them all at once. Perhaps it is something to do with having some of them instanced at an angle.
Here's another pic of the whole thing:
