Great reference pics Wojtek, and spot on re the additional oil tank.
Don't forget Vic, the the entire front cowling on the 'E' was removed, unlike the later, hinged version ot the 'F' onward. The 'saddle' cowling was also one piece, and could be removed individually from the engine cowling. I'm sure you knew this anyway, but as you mentioned a 'hatch', I thought I'd just clarify.