that golden west is not decal and you can tell by scale/sloppiness of the execution....
decals are the only way to get a true scale/accurate piece on models..........
the artist in me says it can be done on micro scale using fine ass brushes and a magnifying glass..........but im not trying to get a migraine from it.
decaling is a bitch too.....depending on the car you are doing it on...better to practice a couple times before you try to deck out that car you spent 19 days weathering. i would recomend you print multiples of any single decal piece you want to place on a car....that way when it rips or crickles you can start over without printing out another sheet.
when actually making the decals....it helps to find a head on str8 shot of the fr8/wall piece you are going to use.....photoshop, and a color photo printer will handle the rest.....and decal paper is expensive. good luck to all trying this hobby....its a time consumer.