The frame is easy to assemble but you just have to make sure it will fit in the tank once it's assembled (I forgot to account for the Euro-bracing the first time around and had to trim off a lot of the frame, doh). But you gotta drill holes in the frame every 2-4".
As for larger rocks, you can set them near the bottom and... ahh bugger, it would be easier for me to show you in person.
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This and that.
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