Very nice revie Jean-Luc
I like that you explain many of the differences of the versions!
Some notes: The MG FF was 20 mm (surely just a typo). I am not sure the 188 was used as a nightfighter. Your statement re the pitot is not fully correct. There are pix which show the mast outboard, so the transition was somewhere during the A-7 production. I will have to look through my refs if I can find pics of these machines .. but I am too lazy
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A short explanation of the fuselages/ ETC thing: the Fw 190A-8 got an extra internal fuel tank. It could be filled with MW50 for performance enhancement or fuel. This resulted in a few adjustments. the tank for the starter had to be moved (among other things) which resulte in diferent new hatches/filling points and the large hatch on the underside was needed to install the tank. The center of gravity would have moved due to this tank thus ETC was moved 20cm forward to keep the flying characteristics ... not very scientific, but I hope you get the idea...
all the best
Steffen