Sav, it's just a case of making a "texture file". Typically this is a .png file (especially if there needs to be some transparent elements) or it could be a .jpg
Here is an example of one that you might use as a template:

which would produce:

You could think of a "texture file" as a kind of wrapping paper.
As for how much time it would take - that would depend a lot on how complicated your design was and how competent you were with the software. If I had to put a figure on the time needed I'd say hours rather than days or minutes
Personally I use Adobe Photoshop and Illustrator plus AC3D for modelling. Freeware options would include Gimp and Blender. A Gazelle 3D model file is available for free (open source) from FGUK for FlightGear.
Edit: here a photo of the real one (from Brian Spur):

formerly a 341D HT.3 (c/n WA1728) XZ931(G) RAF, then N931XZ then ZU-HGZ
Here is an example of one that you might use as a template:

which would produce:

You could think of a "texture file" as a kind of wrapping paper.
As for how much time it would take - that would depend a lot on how complicated your design was and how competent you were with the software. If I had to put a figure on the time needed I'd say hours rather than days or minutes

Personally I use Adobe Photoshop and Illustrator plus AC3D for modelling. Freeware options would include Gimp and Blender. A Gazelle 3D model file is available for free (open source) from FGUK for FlightGear.
Edit: here a photo of the real one (from Brian Spur):

formerly a 341D HT.3 (c/n WA1728) XZ931(G) RAF, then N931XZ then ZU-HGZ
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