joseico90 is a great guy on rcgroups, and I think I'm going to build his new H Quad. I'm hoping he'll have a complete build guide, but for now I'll collect some details here. He mentions "Its not very big nor small, I design it in a very pragmatic way, purely practical, so I can try FPV, GPS, aerial video, gimbals.. etc." He's got a couple of videos on his YT channel.