The current GFN13/14 kinda started when I had similar thoughts some years ago. I wanted to have a go starting from scratch, to check I understood and could do it. At the time GFN15 and above was active on PrimeGrid, so I thought I'd look lower. I think I first tried GFN14 but settled on GFN13 because they were much faster to work on.
As a further check that I was doing things correctly, I didn't even test unknown areas. GFN13/14 had been searched in the past, so I was effectively running a double check of those results. When things got going, I discovered some primes that were missed 1st time around.
Anyway, things started to get some momentum and found their way onto the unofficial projects as they are now. BTW the invite code is listed in the post earlier.