The prob is that, E1 and E4 does not differ only by the guns. There was also a range of modification implemented at the level of the units. So 35 kg is a difficult assumption that I don't know were you sourced it from.
Does it include only the canon, the canopy, the added armor etc...
I think that devs should concentrate on what is representative of the period. We don't need E7/N, 100oct and what ever. We hve already seen the mess with the Mig3U and alike. No more!
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