Advice on FOB bastions?

I didn't do any building during the Beta and am trying to figure out the best way to get something like a bastion going in the easiest-to-build way possible. Snapping and Indirect Fire Shelters is what I came up with. Let me know if you've found a better way! I messed around some with sandbags on a 45 but it was pretty finicky. This was built using an online wardogs base builder.