Seems like you've got your work cut out for you, WB!
Best of luck with the terrain!
One small piece of advice, since you also purchased that Honoured Imperium Space Marine statue: The head and shield are excellent pieces to make molds of, so you can make plaster copies for your bases. The great part about this is that the pieces will then have an actual "stone" texture when damaged, broken apart etc. I've used those parts on the base of my Chaos Knight, and it's really a neat way to get the most out of the kit before gluing it together.