Logistics of attaching components to robots, batteries, board stacking…

Hi, I have been building a basic robot on a chassis like this: http://www.ebay.co.uk/itm/331127894763?_trksid=p2059210.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT Just wondering what people’s advice on the following logistical aspects are: • What is the best way to attach multiple boards (Arduino, Rasperry Pi…)? • How do you attach sensors? • How do you keep the wiring tidy? • How do you manage mobile power? Especially when different parts require separate sources (e.g. Arduino and motors)? Where is it best to place batteries? • Where do you get the supplies from?

Any thoughts appreciated,