You can almost not get it cheaper then this. It’s a cheap as chips plastic case that small children put all their papers and pencils in.
Just got a nice firm piece of foam and trimmed it too size. But it was too thick so I had to trim a bit off the thickness as well. No problem. I just extended the blade on my snap-off blade knife to max and slowly went around the edges until I went all the way through. I put the ugly side on the inside. I’m sure if you do not put all the accessories and extras in, you will be able to put 5 or 6 guns in. And it does not matter if you open it upside down because both sides are exactly the same. And if you want to, why not paint it.