Here are two tanks from my collection, The razorback is about 12-13 years old, (my first tank, aged 14..ah the memories..)and will be given an fresh lick of paint. I like the fact that the new Space Marine Codex discusses this variation, with the lascannon/twin-linked plasma configaration.
The second tank again is about 12 years old. I based the idea on the vindicator from the final liberation computer game. The tank then was armed with a thunderer cannon. I'm planning on have this as a Mk I version. As again this variation was mentioned in the codex in the history of the vindicator.. The tank itself was based on the old rhino, with a massive cannon on the front. I used the largest syringe I could find. The original version had the roof open, with crew interior. I used two plastic marines, some cpu boards trimed around the edge and some shells from another kit for the main weapon. However when GW produced on I felt it didn't look right to have a tank, with a huge weapon showing its workings, so I added the metal roof with the fans on it..