I really want to try a GIF ship drawing in the "Delta Alpha" style (Updated)

I have been looking at The Never Were Catalog, in particular, the "Fictional" folder. There are a number of examples, apparently done by "Delta Alpha", such as the H.M.A.S. Endeavor, a cruiser-minelayer. I have been really impressed by the detail and accuracy that can be achieved at this scale (whatever it is). I would like to try my hand at it, to see what I might be able to do. One issue is that the only tool that I have seems to be MS Paint. I've evaluated another GIF editor (that costs a modest amount), but it seems balky. The scale of the GIF drawing I am looking at seems to be 1 pixel = 2 inches, or 6 pixels = 1 foot.