Open source Inexpensive Cubesat design

I am making a raspberry pi pico-based CubeSat that can be made for a meagre cost. I’m planning to use Lora for communication. What modules would be best for me to use, and how should I proceed with this mission?

I’m using 3 Raspberry Pis for my ground stations. They are reasonably reliable, but require powering down and back up again occasionally. About 2 times a year.

I’m planning to use a single raspberry pi pico as the obc. Wht would be a good recommendation for a temp sensor to use(something that works in space)?