Simplest freestanding 40 Degree Moonboard DIY build plans?

I'm DIY challenged. Is there a good build guide for building a full-sized moonboard? I was advised to not follow the moonboard official guide because of use of 2x4's and 32 inch centers being too unstable. Preferably something without requiring any angled cuts. I think the design of something like this would be simplest youtube.com/watch?v=2FaeMIT…, but it doesn't have exact measurements.