The way this bunch of rich-off-the-public clowns builds things, you're probably right, but it need not be that expensive if they spent our money like it was theirs. What am I saying? They do. Nonetheless...
https://duckduckgo.com/?q=composting+toilet+plans&t=opera&ia=web

At least then we'd end up with something more people would actually sit on. They could have asked for our suggestions as to what to build, or given us a choice, since we're paying for it, and avoided some of our hindsight criticism if they'd merely asked us what we'd prefer for our hinds. Light & tough kayaks would have been my first choice, rather than benches or even RV toilets that would increase mpg. 

Bicycle helmets are another area that would benefit from carbon fiber, since current models are mostly single-impact to hold weight down. This outfit needs demonstration projects that will capture the public & manufacturers imaginations, and show the unwilling backers (the public) that we get some personal benefit.