A disclaimer: this is totally ripped off from Wargames Illustrated 382 and David Bickley who built the original. You can read his blog here:
http://www.talesfromghq.blogspot.co.uk
I kept coming back to this article and mulling over it. I really don’t have time to get distracted by another project but it was sooo tempting. Late one night I pulled out a piece of paper and started doodling. The next day some graph paper was procured. Too late! Project started!
As Mr. Bickley had produced his model from individual parts I decided to follow along and make mine in modules starting with the front gate.
Upcock 
Me being me, there have been a few upcocks in the design, but nothing that a hammer wouldn’t sort out.
The original suppliers who inspired this build are:
genuine grumpy old tin 