It will actually be pretty flat, so the overall volume shouldn’t be much bigger than my previous builds.
As long as it fits in my backpack, can be carried in one hand, and runs on batteries for a long time I consider it ‘portable’ 
Obviously not a typical flashlight form factor, or EDC size, but it should still classify as a flashlight by definition.
Honestly your and djozz’s fresnel builds also fit the description so that’s why they’re on this list 
Although I do personally prefer calling lights this size “searchlights” instead of “flashlights”.