Here are some Leman Russ variant conversions done using the regular Leman Russ kit and plastic tubing, card and rod, as well as bits from the new Demolisher kit and other
GW kits. If you want more information on how these were done, please see my workshop article on this topic
on BoLS.
Punisher with three heavy bolters:
Exterminator with plasma cannon sponsons:
Demolisher using the new plastic Demolisher cannon and multi-melta sponsons:
Vanquisher using plastic tubing:
Eradicator using plastic card and rod plus a Hellhammer cannon from the Baneblade kit: