Not wanting to have an ignition switch related breakdown on the road in some obscure far away place, I installed the Eastern Beaver relay loom on my R3T. Very easy installation and top notch materials and workmanship!
The headlamp is way brighter now than it was with the stock wiring. That's a lot of light when you can actually see the difference during the daytime with your naked eye! To be sure, a very good modification to insure reliability of the bike.
As for making your own loom to save costs, why? EB's price is very reasonable for the quality of product they sell. By the time you buy the materials and then build the loom, your time and material costs would be close to EB's price shipped anyway.