I built my 7" longrange Kwad with a low prize in mind. With the Frank 7 clone of the FR7 open source frame and the flashhobby 2507 for 13$ each. I would recommend the cheaper Soeedybee F4 instead of the F7 V3 stack. The build quality and efficiency of the motors is worth the bucks. The setup flies smooth and fast on the 6s 3300mah batteries i got. For the printed accesories i reccomend my GoPro Strap and GPS mount i put on thingiverse. Enjoy :) https://www.thingiverse.com/thing:5647320