What book would provide the absolute best information on the different modifications of the Bf 110 G-4?
Regards,
Timon
I don't know if it would be "the absolute best" but George Hopp's 1986 slim book on the Bf 110 G for the Monogram Close Up series might be worth looking at:
https://www.abebooks.co.uk/servlet/S...=&kn=110&isbn=
It does go into lots of details of equipment etc.