Similar to the one on the left in my tank then I assume? Not too difficult to put together, just start with two medium pieces, bridge them with a large piece, and go from there. You can see in some parts of my tank photo that I have PVC frame under each of my islands. If you're having trouble creating the shape you want you could do that -- shape a PVC "box" to about half the size you want your island, then just cover it with rocks and voila! There's added benefit too -- good flow underneath everything...