There does seem to be a lot of secrecy around cell comms. From the handset radios to the protocols, etc., etc. Some good videos about this by osmocom folks.
And then implementing something like this seems to be "if they can figure it out great but I'm not putting my name with that" out of fear of the authorities.
Have you got your hands on a commercial femtocell? Oh osmocom were giving away femtocells for free if you can contribute to the project. Not sure if they're still doing that.
Cayenne are good. The Ghost peppers had one flavor; pain.
Haven't thought about it at all. But it's not likely.
Although an idea came up the other day for something I'm making from natural materials but I was thinking of adding an IoT device to it so I will have to see what kind of prizes are awarded.
The hackaday crowd looks to be reasonable too.