Correct, the primary issue is that the two hulls have different turret mounts. So presuming you want a rotating turret, surgery will be required.
The simplest solution would be to get a spare rhino turret mount (one comes in every rhino hull kit, IIRC), and cut it down to fit on top of a chimera, at the same time chopping a big hole in the top of the chimera just slightly bigger than the turret hole.
Or hypothetically, you could somehow mount a chimera-style turret pin into the bottom of a pred turret, so that it then fits a chimera hull?
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