Love the video! Looked for a how-to on your ground cloth, but I could not find one. Is it green felt that you paint, to create the mottled look? Would love to see a video on how you make the ground cloth. It looks amazing, and it looks relatively easy to use. I love that your hills are covered identically.
I did similar, but I used indoor/outdoor carpet. It is nigh indestructible, and it will last 20+ years without even aging in appearance -- I know, I used a lined texture carpet initially, for over 20 years, replacing it with a smooth, non-textured carpet around seven years ago. I re-used the old carpet to cover my wooden steps within my garage -- now it is aging with use and grime. LOL!
I used my Proxxon Hot Wire Cutter to carve up some open cell foam into hills, covering them with the same carpet.
I recently added paint to my carpet-covered hills, to break up their monotonous appearance. Thinking of doing the same with the ground cloth piece which is 5.5 feet by 9.5 feet. The solid green color is nice, but very monotonous. Thanks for sharing and inspiring. Cheers!