It wouldn’t be hard to do if you have access to a chop saw and a welder. Now that I’ve built this one out, I will be doing custom going forward also. The challenge will be coming up with the straw matt. Which you can order replacements through this same site.
I plan to sit mine on the edge of a CRP field. I’m actually going to build a small platform for it to sit on. Just so I can be slightly above the tall CRP grass. I’m thinking 18 – 24 inches off the ground.