[Piotrsko]

Kinda rule of thumb: double the weight you want to carry and size components accordingly. Figure 18" minimum, not including prop disc outside structure profile. Bigger is more stable, but with gyros size could be redundant.

I have a couple motors that would support 10 lbs thrust, but not 100% duty cycle so you want to gang (correct word?) a couple more to reduce the motor heat load, but that significantly increases battery size, even more if you need to loiter longer than 10 minutes. Figure maybe 400 watt hours of battery, need to know motor draw to spec design better. Obviously more motors, more thrust, more complexity but more stable and bigger payload.

There's a couple trick questions thrown out there on the spotlight: 120k lumens is ok but what is the emitting device? Leds? 120 k lumens is about what one of my filament foglamps do each and the viewing specs are about the same. Not even hardly the brightest flashlight.