I'm new here and I was looking at some project published in this section and I mind how to pick a movement. I'm a total newbie, this is how I see it: First you have to choose between quartz or automatic, once you go automatic which are the factors to pick a movement over another? size of the case? let's say I have a 38mm case 7mm thickness, I know there's an ST18 made by seagull, how to pick a miyota movement based on this? Do you have to cut the case based on the movement?