I am looking for an affordable GNSS receiver for precision agriculture.

Hello everyone. Sorry, may I ask a question?

I'm a bit confused... Currently, I am looking for an affordable GNSS receiver for precision agriculture. I know that there are many options available in terms of price and quality. However, I am also wondering if it is possible to create a DIY RTK receiver. I found an affordable kit for RTK on this website: https://gnss.store/gnss-development-kits/147-elt0130.html. But I still doubt my capabilities to do it myself. Maybe someone has experience in this and can give some advice? I would appreciate any help. Thank you.