This is a fantastic hardware setup if you want to give #Meshtastic a try. I added up all the components and this is cheaper than assembling it yourself. These RAK boards will run for days on that battery, also.
I'd say this is buy once cry once for a Meshtastic node. I can't think of anything you'd add except maybe a better antenna, and those aren't super expensive.
https://store.rokland.com/collections/kits/products/wismesh-pocket