There's pictures of the D-cannon and Vibro Cannon in the Eldar Codex, back in the color pictures. Otherwise, the Shadow Weaver is the one that looks like a giant version of the Warp Spider's gun, the Web Spinner. Vibro Cannon has a series of ridges along the barrel. D-Cannon has the longer smooth capsule like barrel on the end.
For putting the platform on the base, I'd drill a hole in either, and mount it on some form of post or another so it's hovering over the base.
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