Hello VD,
the tug is really cute. I am thinking of re-doing it one day, using the WoW model as kind of a 3D plan, so that we can use it in SH3 without legal problems.
Instead of using the non-operational 6-pounder guns, you could decide for 3-pounders. I think, after comparing size, especially barrel lenght, the original guns of the model may represent 3-pounders. However, there were so many variants of the Hotchkiss 3-/6-pounders ...
Or you give the 6-pounder 3 inch or 88 mm shells. Note, in SH3, the 88 mm shells are less powerful than the 3 inch shells
Well, the 2pdr shells are just as powerful as the 20 mm shells, less powerfull than the 37 mm shells, which themselves are half as powerful than the 40 mm shells. Very realistic ...
Cheers