Cant comment on the technical aspects of this post...however, wanted to respond on behalf of the "lefty" point of view...I find that if you are picking up a piece of equipment and dont know about left handed options or there are none..it seems normal to do it the "right handed way" e.g. golf/guitar springs to mind (as I didnt at the time know of a left handed option)...however, when you do have choice then the lefty side overtakes that...e.g Cricket bat, tennis racket, writing etc...funny how the brain works..so far in windsurfing I dont struggle with anything more than normal because I am a lefty. 
Being right handed/footed doesn't always mean that the leg is stronger... it's just more co-ordinated.
I can kick a football further with my right leg but on one legged squats I can get lower with my left... left is strong, right knows what it's doing.
Tick for the eyelet and pulley hook combo... failing that can severne make a little bit more space in their downhaul eyelets so that I can thread the rope more easily.
I nit you shot.
After posting the above I quick glanced through the rest of the boardseeker article I grabbed the above photo fromhttp://www.boardseekermag.com/new_to_windsurfing/how_to_rig.htm
...and there it is. A mirror image mast extension:
I'm pretty sure the end of the world is nigh.
Found a rigging guide from another sailmaker showing the starboard side.
Old mate is still using his left foot..
It should be noted that the Severne base is totally flat across the bottom so you can actually use either leg, not like the Chinook. I am still trying to figure out if anyone is actually seriously concerned about whether the down haul rope exits the base at the top or bottom......
I'm a lefty but I still wind the rope on mi cold chisel and use both feet
I must have delicate hands 
Lol in hindsight my editing of that downhaul diagram was probably only funny in my eyes. Still the most important form of funny..
The joke was that it was clearly a HSM superfreak (note the excessive stitching and devo reference), comic sans text and the guy rigging it has sandals with socks. These are all funny for reasons.
kicks in come time to uncleat the downhaul to click the camber inducers into place, as there's not enough room to pull it out of the cleat. It also seems to kill the feng shui when im trying to yank on the downhaul too, but I'll put that down to being un-co
