LordPickle

I personally think 3" is good to start off with, as long as you're planning on building instead of buying a prebuilt. I started with a 3" volador, (still my only quad btw) and its got enough power to fly outside really easily, but its still small enough that it doesn't sound like a small child being thrown through the air. If you plan to go bnf though, 65 or 75mm is probably best

I believe the hdzero boxpros also have a hdmi port, I'm not up to date on how much they cost but they're good value for the money

I'd have a look at boat prop development, I think that you may find a good starting point there. They're larger scale so small innefficiences and vibrations are noticed more, and have been developed and messed with a lot more as well.

Those motors look absurd on the 3" lmfao! Gonna be fast though. What motors are they, I'm assuming 6s?

Can relate, thats my biggest problem with the 15-20 minute life on my dji mini 2! Average temperature where I am is usually 10 degrees celsius, so unless I've got my good gloves on I can't stand it

Even just having 2 tpu plates stick out infront of it would help massively, only has to be a couple mm's. Good luck with it

Looks great man, I'm yet to get my vx3 build up and running but I'm looking forward to it. Just a suggestion, see if theres another hole on the camera mounting plates that you can put the camera on. Having it sticking out like that is likely to damage it in a crash.

Probably just try a couple of different sized 6s batts, from a reputable brand like tattu or gnb or something. Maybe something 600-1000mah, just see what combination of weight and flight time you prefer.