Nice work on those Boeing 707 variants. I do have some doubts about the Beech Model 1080 refueling pod that was utilized on the Brazilian, Canadian, Iranian, and South African variants. To me, it seems to be somewhat lacking in detail and not the most correct shape. This refueling pod used a two-part hinged design in which the drogue was actually extended from the lower part of the refueling pod in flight.
Note that the Italian Air Force 707s actually utilized the
Cobham 34” Series Wing Air Refueling Pod, which is a different shape and functions much differently than the Beech Model 1080. You have the Italian variant depicted with the wrong refueling pod in this case.
Additionally, on both variants, the line where the hardpoint for the refueling pod meets the underside of the wing should probably be emphasized with a darker colour. Right now the hardpoint just blends into the underside of the wing which doesn't look right.
Here are the changes, did my best to get it look more like the photos, thickened it and added some detail.
And here is the first set of the C-135 Templates (about 75 variants in total to draw as far as I've counted):