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Is there a way to convert a chimera to a Hydra? I'd like to run some eventually in a tournement and need to actually make some instead of proxy my chimeras. Thanks.

The planetstrike barricades set has a quad mount gun and box you could use.

Old Crow miniatures does some weapons turrets that will also work (however, he is now an official maker of models for two miniatures games in production and delays are there because of this).
This is what I use:

with some cannon barrels (also from them - 50mm) and spare autocannon drum mags from bits).

There are also several other makers of parts that do quad autocannon AAA mounts for gaming in 28mm (couldn't think of the maxmini one).

Max Mini makes these. It's a little bit big I think (but about right if you compare to Epic scale Hydras) I'm going to expand a Chimera chassis a little bit longer and wider to mount this