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In short, I need some third-party demonic models, which are about 6cm tall.for the purpose to conversion some unique Daemon Engine.

There is still no new daemon engine, especially the antique Defilers. Now those GW daemon miniatures are either too expensive or not suitable for my needs -- I hope to make some more Doom-style demon engines,or-----something equivalent of CyberDaemon.

Are there any third-party demon miniatures suitable for this case?

Various board games models are your best bet have a look on ebay. or possibly Reaper.