The guide has written with the pre modded speed controllers now available in mind.

From what I understand this mod can be done with standard controllers but I have never done it myself, I belive Ian lockhart from the Ewe2\Cutlelt team did a modification before this fix became available so maybe he can shed some light on this. It also used to be possible to send controllers without the mod back to electronise to have controllers modified for external relays as i have had this done but be warned it can take a while.

Your relays sound suitable. Most people use automotive relays available from technobots maplins and many other retailers.

Sam Partially responsible for Thuggernought