A Challenge Accepted! (MOATS)

I've been a bit low on my hobby mojo, with my slowly developing EADL and general lack of enthusiasm for gaming.  But then, an intriguing idea is presented, and hobby mojo is restored.

Drax was having a thought about the lack of moats in 40K

read it here
http://admiraldrax.blogspot.com/2012/10/337-deep-thoughts-why-are-there-no.html

I decided, why not.  I can make this work.  I can build a US Civil War inspired fort on a 2' x 2' board.

Here's my initial plan

•  to limit the vulnerability of the bastion by moving it below the ground level.
• provide a firing line on the far side of the moat
• make the outside surface filled with craters and friendly to infantry and not so steep as to make models fall over constantly

Here's my inspiration

Fort Macon, NC