Actually it's a Chimera.
"No!" You cry "It's a Land Raider!"
Look again. A Chimera (not the tank, the mythical creature) is a hybrid of two other creatures. Well, so is my Land Raider.
The main tank is an original Rogue Trader model but - as those of you with long memories will know - the lascannons on that old model were prone to snapping off.
So I picked up a weapons sprue from the newer marque of the model and did some chopping and changing, added some foamboard moved some hatches and ended up with this bad boy.