Josh, I've done a bunch of stuff with the HPI on the Monza. The HPI is pretty much the same for all bikes so the information should translate. It is an awesome CDI, but the accessory coil is a piece of shit. I finally had to go to a constant loss battery system.
That MB5 belongs to fellow Bat Bryan C. You can find lots of photos of it on Bats in the group ride section. The engine fitted is from a CR85, and the bike is incredibly quick. The guy that did the conversion lives in SoCal. He did such a fantastic job that the bike looks stock.
You can see Bryan and the bike a little bit in this video--he does the Jesus Cross.