I am discovering more things. I have good hope of making all of these changes. Top part of cannon, is not supposed to start at the front edge, but have an inset of about 5mm according to photos.
In sketch version 20, I have arranged the numerous hand wheels in sequence, and the spans in between the hand wheels was made equal. I added a third hand wheel where I once thought there were only two, and fortunately it made sense to also widen main shape by 5 mm, perhaps two fixes in one if I am a little lucky.
I think, if I turn out to be a little lucky here, if extending the main shape by 1 cm in total (0.72m in 1:1), I can perhaps just extend the big floor on rear top, by same amount.
Full png file: https://ibb.co/LZHdJMX
Note: The German book on railway cannons, on page 160-161, have a side view plan drawing, however this looks like a concept drawing, and not the real thing, so I don't trust the measurements given. Maybe just a related project.
Same drawing, but with the other half added to show the full length of the main shape.
When switching over from Photoshop to GIMP (free) the transparency in the layers got messed up and pixels for antialised lines for the wheels got shifted. Have to clean that up later. Unsure if I want to re-work the wheel area on the carriages more, as it would probably require further changes to the kit parts, which may or may not be difficult.
30. December 2018 at 14:34:52