I agree with Greg. This is very timely. As of now, Trevor is using Astrophotography Tool to control his camera and focuser, but that's pretty much it as far as I can see. I have to give him a lot of credit for getting me into astrophotography in the first place, it was his blogs and YouTube videos in which he documented his progression step by step and how he overcame obstacles along the way that primarily motivated me. Then a friend at our club here just mentioned that there was something called Indi and that he had not been able to get it to work (a year ago) that piqued my interest. Because, whenever someone can't get something to work, I somehow have to prove them wrong. I know, that's a major character flaw and I am taking injections for it....
It took me several months to navigate the (steep) learning curve, but now Indi/Ekos is working (almost) flawlessly for me. At some point, though, someone has to write a manual (in book form) about this system to help new users get the most out of it faster. The key individual modules are all robust, and with a few minor tweaks the internal guide module will be flawless too (about that elsewhere). Same with the scheduler, the crown piece which ties all the other modules together.
I think it is going to be the scheduler and its ability to integrate all the other modules, including, as Greg has pointed out, the solver, and then run autonomously throughout the night that would get Trevor sold. He has a daytime job and the more time he can leave the rig alone and sleep, the more priceless the control unit (hopefully Stellarmate) will become.
And I agree with Greg, now is the time to break into that market. If Trevor takes it up and starts using it as his primary tool, Stellarmate will become the standard.
One more thing: As much as I like my Pi3, it is slow as molasses when it has to run the entire package on its own. Especially the solver struggles with long focal lengths. I would suggest adding a miniPC with 4 GB RAM as an upgrade alternative for the Pi3 and provide the image for it. Yes, it uses more power and in the field therefore, the Pi3 would still be the preferred hardware if running on batteries only, but if someone has access to more power, the miniPC makes the setup just so much zippier and more impressive. One word of caution: Not all miniPCs have full functionality with Ubuntu. My Zotac pico332 runs flawlessly with Ubuntu MATE 16.04 and Indi/Ekos, but in another one I tested the driver for the internal WiFi module is missing in Ubuntu and as a result I have to use an external WiFI module. That's a turnoff for a new user. As Greg writes, the whole system should work straight out of the box with minimal problems.
One more thing: When you work with Trevor to use StellarMate for the first time, perhaps you might want to think about chronicling that experience also here on this forum? There are two reasons for it: First, I (probably many of us) would be dying to follow how it is going in real time, and two, it would create Google links between Astrobackyard and this Forum. And once other users then search for Astrobackyard, they would also be directed to Indi and to StellarMate. In other words, think about effective advertising.
And since French seems to be on the verge of becoming the dominant language on this forum:
Viel Erfolg!