If the non-US skins are still being corrected, I respectfully offer a few tips in case Shrike is reading.
CANADA
For the lettering I recommend starting with my font RCAF_60SQ_ATH, which sometimes has a _GIMP or other suffix in versions spread around the web. Note that there are variations of the letters and numbers embedded in this font. Unshifted, it types the variation that I found to be most common in my research With Shift, a second variation is presented for many of the letters and numbers, often the more squared version more commonly seen post-1960s. Sometimes I found a third variation that I wanted to incorporate, and mapped that to some unused key. for example, Shift-semicolon gives you a third variation of the numeral 0, the quotation mark is a third variation of the numeral 2, the apostrophe is a third numeral 6, and so forth. Try variations and see what is closest, then you can edit.
For the roundel, somewhere on the keyboard I put an accurate vector dingbat of the RCAF maple leaf, but I can't recall where! If you find it, you can scale and center it in the roundel. I believe the proportions of the blue and white in the roundel were the same as the RAF type D, i.e., the white disc is 2/3 the diameter of the blue disc. This is not the same as the current roundel with the post-1967 leaf from the Canadian flag. Note that on almost all RCAF Sabres, with a few exceptions such as the Golden Hawks, the wing roundels were not aligned with the direction of flight, they were turned inward to align with the wing sweep.
NORWAY
My font RAF_WW2_851ATH is pretty close to the buzz letters on the Norwegian aircraft, and again there are some variations. My shifted M is closer to the Norwegian than the lower case M. The letter A used by Norway is unusual and will need to be done by hand.
On the Norwegian roundel, the fat side of the triangle always faces forward; I think it is meant to represent a flag or pennant with the mast on the fat side. In the trailer, the roundel on the left fuselage incorrectly had the triangle point-forward.
August