It turned out really well, and was really easy to make:
- Cut the straw into the six pieces of the same length (I made mine 2")
- Cut some bits of straw to random lengths (shorter than your original six pieces)
- Now super-glue the six equal pieces into a stack formation, and glue the random length pieces round it, like so:
Here are some photos next to a MERC for scale:
I plan on giving the stack a quick once-over with some grey spray paint to add a bit more of a concrete look to it - but I think it looks decent in black too. Happy wargaming!