Here is the mark-up I did earlier this week on that same schematic. I was wrong though, its a 2 pt. perspective, not 3. That is how I was able to calibrate the scale… The long chamfers offered a bit of a challenge to think thru, but I just projected the lines of the bottom corner up and the top/back corner out to the front top to create an intersection. This was guesstimated to be relatively accurate as they show an round over on the top edges.
I think this is a good start for reverse engineering some similar. The crossover talk breaks out of English for me. Still learning.
Later gents!
Mo