I love do-it-yourself projects. The problem solving, the tool acquisition, the gathering of required materials, and best of all, the part where I get to tell people I made it.
And if there's one thing I love to read about, it's other people's obsessive, large-scale DIY projects.
If you're a hopeless tuner, you might want to have your own Dyno. Or, if you've got a community garage/tool library with a bunch of your buddies, this would make a great addition.
Check out Steve's DIY Dyno.
I bet that if you are properly motivated, have a machinist friend who will work for pizza and beer, and you have a good understanding of how these things work, you could build it for less than he did.