Awesome! That's a ton of cool info.
It sounds like the HL 450 isn't coming to market anymore? That's too bad, it looks like a great product. I'll have to look into the MT1.
I did look at the MOXA boxes, and would be interested to hear how you use them. Are you on the same LAN as the results computer? The internet at our starts will almost certainly be a cell hotspot, and the internet at the bottom runs through the corporate filters, so I thought making that connection might be tricky for us. I'm also self funding this project in my downtime, and the raspberry pi was more in my budget
Thanks for the replies, it's great to see how other people are doing it