Attempt 2 got a lot right.  1 trick is installing the switch requires a custom tool: wrench.FCStd

It burns 4W when it's cold, rising to 5W when the LEDs warm up.

Making the handle short enough to fit in the battery tray required making it harder to fit the battery in the sides, but it does fit in the front & back. 

There is still a desire to turn the legs into 2D panels which fold completely flat.  The mane challenge is it requires the battery tray to get a hair longer & become a trapezoid.  The battery would only fit in the sides & it would wobble a lot more.  It would be worth millions in rent.

Another desire is to stand it on its rear end, so the back needs to be flat.