That's hilarious. But I know exactly what you mean. The mind just fills in the correcttion to make it appear smart ... until we post the thing and then the first guy comes along and rakes us over the coals....

By all means make a semi scale version if you really MUST use a pusher motor. But plan on increasing the wing chord. Models often do not translate well if scaled too small and wing chord is one of those things. Scaled to 400'ish sq inches the Predator planform will likely have a whopping huge 5 inch chord at the root and 3 at the tip or smaller. This will mean a high aspect ratio, which is good, but a terribly small Reynolds number for the airfoil, which is bad. Studys of sailplanes have shown that the minimum wing chord to achieve the best Reynolds bang for the buck is about 7 inches. This is why 2 meter gliders seldom have high aspect ratios but open class sailplanes do.

For your camera model a semi scale version with an aspect ratio of around 6 is going to offer the best all around performance. And 6 is pretty stubby. It ain't going to look very Predator like but at least you can use the planform.

Nose and tail moments are going to need to alter in order to ensure balancing without the need for weight. Perhaps make it so the wing can shift over a 3 or 4 inch range in order to balance the model at the best % of the chord.

The Predator uses a crazy long landing gear and that subfin to protect the prop. If you're hand launching then great but if you need gear it would be best to just use a dolly.

There's another issue too. WIth the motor and camera at the extreme ends of the fuselage like with the Predator you have a lot of inertia that is going to fight the ability of the model to pitch and dampen the pitching motion. Mass centralization may be better at model sizes to avoid any destabilizing and resonant cyclical issues.

With electrics it's easy to do twins. And a twin setup moves the motors out away from the camera. I'm thinking that an arrangment sort of like a C-119 Flying Boxcar may be sort of nice. The big pod offers up lots of options to mount the camera in various attitudes for different viewpoints.