It's exciting to see this project coming along, thanks for all your effort. I see you have support for windows using Zround. Registered for it a few days ago but can't download the software until "an admin" approves my account. Next Level Timing also supports Zround protocol among several others. Also seems responsive to adding hardware to their compatibility list. https://nextleveltiming.com/

I'm getting ready to buy the parts for the decoder. Banggood has the Hack RFOne for under $100. I have a couple mrt and rc3 transponders to test it out with.

I'm unsure of some things. My plan is: antenna> active SDR loop amp or 1:9 balun (both similar priced ~$12)> RFOne> - from there could I use an HP thin client running linux (i have one already collecting dust) instead of a RPi? Keep this all in a pelican case and connected to wifi. I would then be able to run timing software on a windows PC connected to the same lan ?

Regarding the OpenStint transponders, I plan on ordering them once I get the decoder working. I'll gladly share any .stls I create for 3d printed cases. Do you have any recommendations for flashing them? I figure it wouldn't be too hard to make a jig with pogo pins.