As I understand it mosonit/harboard/pressboard/eco-whateverthehellthisboard is all the same material made by steaming woodfibers and pressing them in in big ironing set up. Which I recently learned doesn't have any glues, which makes for a great material to laser cut as no toxic gasses are produced (check the sds).
This stuff will 10/10 disentigrates if exposed to rain. I can't imagine anyone using it for siding, but maybe I am confused on the name/product.
Hey now, don't look to closely at this one and you WON'T notice that the bandsaw cut to seperat the lid is off by 3 degrees
Have you posted any pictures of your work on the forum? I am still learning my way around here and am wonderning where sillyness like this should go.