Thanks for the support everyone! I think I might really go for this.
I talked to Zach and he is interested in this idea too. He has been working with our kids and some friends on building and engineering related learning projects. He is working on setting up a workspace in our garage for the kids and their friends to tackle projects along the lines of Tinkering School. He's setting up an adjustable height workbench, tools and scrap supplies to see what kinds of stuff they can come up with. He said he'd like to do more of that in his spare time. He says he's had a few adults even ask if he can teach them some basic handyman-type skills. Come to think of it, Gever Tulley of Tinkering School is actually a software developer, if I remember correctly. Maybe this isn't such a crazy idea.
I think to make myself feel more confident I'll run whatever I come up with past my mom, who was not only a teacher but a curriculum developer for a community college. I'll see what she thinks and get some advice.
There really does seem to be a need for something like this. I know so many people who just don't know exactly where to go to get their kids what they need. I tend to think that if I am doing something, it's not a big deal and anyone could do it. I need to stop thinking like that.