Good looking model and you're right; those things aren't easy. I've found when building them that it helps to pre-curve all the edges before gluing. Ball bearings work just fine; just lay the cut-out model face-down on a computer mouse pad and roll over all the edges with the ball bearing, inducing a curve into them.
For the attachment strips on mine, I used disks cut with a paper punch. They work just fine and you can make a bunch really fast.
And you're right in that with these models, going with a thinner paper generally makes for an easier build, although "easier" is a relative term here.
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