(posted 8845 days ago)Either get proper scaffolding or else have the bed (nearly) vertical. Don't try a DYI solution with a board on two ladders: it is not nearly stable enough and if you fall and hurt your model you will be in a bad position.
By all means go to great lenghts to obtain great images, but not to the point of risking other peoples health.
I have previously had good results with standing on a sturdy table (for height) with the bed at an angle. Not exactly from the top, but it was good enought for what I wanted. (Soory, no images on-line.)