I've built several quads of this size and thought it might be helpful to share a few tips I've picked up along the way. Cheers!
Setup Details:
Frame: Twin Quad Frames Gemini 2.5
Motors: Hypetrain DAB 1104 7500kv
Battery: Pulse 450 3S 75C
ESC & FC: HGLRC Zeus
FPV Camera: Runcam Micro Swift
TX: Spektrum DX9
RX: Spektrum Race Quad Diversity RX
VTX: Wolfwhoop TX3 200mw w smart audio
My 3d Print Designs: https://www.thingiverse.com/RyThomas/designs