I wanted to build a 3 inch drone which i could fly in parks and have 1080p@60fps video recording so i came up with these parts for best power and video recording.
I chose to use the split2 as it is very lightweight and wont effect the flight characteristics too much. I chose the frame as it was specified that it was designed to accommodate the runcam split 2. I used the stock antenna as it is more rugged then any other cp antenna. It is crucial that you use the f4s from racerstar as its usb is located in the back of the quad as usualy the front is cluttered with wires so you can change pids and settings without dismantling the whole quad. I am only using the f20s from T-Motor as i have been using their products and i know that they always have the best motors and they are never affraid to do updates on their products.
In the misc part you will see a 3M velcro like fastener i use that too fasten my batteries to the quad i just stick them on and they work like a charm, i have even used them on my 5 inch setups and i was never able to get a battery to fly away when doing flips and tricks. You should use that velcro for every build you do i also use them to mount the quads on my wall.