To add a few more facts to the mix: chances are that there will not be a GUI. In fact, it was tough to get a GUI made in the first place, and in the second and the third place, too. I tried three times to get this project off the ground and it was always the GUI development work which stalled it.
Instead of the GUI you'd be tinkering with configuration files, just like with AmiTCP in the old days. The difference this time being that Roadshow automatically rereads the config files after you have modified them. You won't have to restart the network just to make the changes stick.
As for documentation, I'd have to write a basic cookbook on how to set up and use Roadshow first. On top of that, there's always the SDK and the existing documentation for the individual shell commands and configuration files.
I have no idea what to do about the distribution yet. It could be a download from a web site, it could be mailed out on a CD-ROM. What would you prefer?
As for reasonable pricing, I haven't got the foggiest what a reasonable price would be. The nominal 10€ are at the lower edge of what I would consider reasonable. What amount would you consider reasonable?