You could attach stuff to the 2x1 piece with the rod, using some Plate 1X1 W. Up Right Holder and some Corner Plate 1X2x2. Both pieces can be found on PAB. This should give you 2 studs per side to put missles or rockets or whatever.
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I used a black droid arm in my hardsuits that attached two 1x2 rail-like pieces together. Check it out: http://mocpages.com/moc.php/125756 about halfway down the page. Hope it helps!
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