This is an Epic Battlegroup of mine.The models are from the 1990s.
The Warlord Titan is the original plastic model from the original Adeptus Titanic game, complete with plastic weapons.
The Land Raiders are plastic models, whilst the dreadnoughts are the original metal castings from Space Marine.
The scenery is from the (now defunct) Snapdragon Studio.
The models were painted in a similar manner with a light brown base coat and an ink wash.