I was working on a hidden UAV base a few days ago that I scrapped about a third of the way through. I'd bitten off more than I could chew so I left it. I did save the UAV and a bit of the cliffside that I'm showing here.
The bit of cliff. Yes, the rat can fit down the tunnel though it gets stuck at the bottom. I really like this for it's clean lines and simple but cool look.
The unsightly back.
The UAV loaded with chem rounds. Wasn't too difficult.
It even comes with folding landing gear.