shadow of mid fuselage is 3-4 pixels wide. left wing is 27-ish pixels. Shadow of two fuslages and the inner wing is some 16 pixels.
IF the mid point of fuselage is circular (which it very well may not be) and if it's indeed some 1,3m in height as i roughly estimated in another forum - we might get the following numbers:
6 meters for width of two fuselages and the middle wing surfaces, 9,6 meters for length of each wing. Total wingspan some 25 meters.
If the mid point fuselage is, oval-ish, as speculated by the latest drawing, then the shawdow on the ground might reference something closer to 1,5 meters of width. Overall wingspan might in that case approach 29 meters.