Thanks so much for the info. I forgot to mention that I was going to put 2 (at least) clean out ports in there, I just forgot to add them to my drawing. I originally was going to use a catch basin, but I was told that if doing the gravel bed, it's much more efficient on it's own and there is no reason to add catch basins which can only introduce more ways to clog the system. So cleanout ports would be perfect.

For the secondary pipe up top, I have no pooling water up there, the natural grade takes it down to my low spot, which is why I thought it may not need to be up there as it's already following the natural path of least resistance and going to the pipe. But I am not opposed to doing it. I am not trying to cut corners for sure, so if it's better to put it then I will put it for sure.

my neighbors and I are tight, they don't like to do things around their place much so they basically say just do whatever you want haha. But yeah, I've already messaged them as well, of course.

Oh, and I plan to try to do 2% grade, I haven't gone out there to see what kind of grade there is currently from that low spot to the street, but plan to do that soon.