Here are some plastic The Contemptor Pattern Dreadnoughts.
I actually used them as robots, mainly as they didn’t look anything like dreadnoughts!
The Contemptor Pattern Dreadnought was once a mainstay of the armoured might of the Astartes Legions of old. Larger and stronger than standard pattern Dreadnoughts, the Contemptor’s systems featured many examples of techno-arcana steeped in the sacred mysteries of the Legio Cybernetica. Some chapters still boast these war relics amongst their ranks, and whenever the Contemptor takes to the field of battle, it is an echo of the power of ancient days.
Though they first appeared in Epic, Forge World have recently released a 28mm resin version.