-- last, I recommend you lookup user Lugia on this website, and examine a lot of his different draft racks. They tend to be very thoughtful and give excellent ideas of what different well-designed modular systems can look like. There are some good designs by other folks too, but I know for a fact there are a ton of interesting draft Lugia racks available to view.
HI, yes I would second that. Lugia is ace because he really goes into depth explaining his choice of modules. Helped me immensely.