Finally got around to shooting the final assembly video and some testing. Overall I am super pleased with the results of this project. At the heart of it- I truly believe there is a product which can make a real difference to real people all around the word. Getting it out there completely open-source via Hackaday was just amazing timing and I couldn't be happier.
In the video you can see I switched around the transmitter module. In the next revisions I will need to get a better gas sensor (commercial grade) but in the interim I will just remove the individual gas readouts and make this unit transmit a simple SAFE, WARN, or DANGER call out for all 3.
Also thanks to comments here I will add an RGB LED so it will provide a visual indication as well in case the user is within sight and wishes to use that as an indicator. As well I will add some battery voltage monitoring with LED and voice call out as well. Very cool :)
Make one, make it better, share it back with the world! Cheers