wilbus , i skin in this way..
1st and most important. get the panel lines down onto a new layer, takes a bit of tim but if you use the draw button and do all vertical lines then all horizontal lines.. then do the fiddlely lines you can do it quite quickly..
2nd do the rivits... you can use the same line tech , but set it to do a dotted line.. and so on..
3rd.. now the fun part painting.. think of how things are in real life..start off new and get old.. so start with your camo paint and work up.. so things getting scratched( around the places where people work are most scratched) and dirty .
4th things move so an oil spill and gun smoke move in certain directions so paint on oil and smoke with brush and use gausian blur and wind effect in paint program( you may have to rotate you pic to get right effect)
but most of all use layers for everything(and name them before you use them).. the 190 has over 50 layers
what would be good is being able to post the skins with all layers available so people can see how they are put together..
also have a goos source of pics to work from.
good luck