If you aren't going to be racing, there is no need really. Just the standard tightening up of the suspension, which the modern stuff will take care of. Tapered bearings of course when converting the front forks. If you are doing it for the cool factor, then go for it. Some of the Denco stuff is unnecessary. Just remember you are tying the steering head to the swingarm pivot, and stopping any twist in the steering head.
One thing guys miss, is adding modern stuff usually adds a lot of wheelbase, and trail, which is going the wrong way for good handling. And can make the bike handle really strange. Figure out your WB, rake, and trail beforehand and then adjust accordingly before final assembly.
Here are the mods I did to a h2 frame for racing at Daytona. Not as pretty as Oxford's, but the down and dirty, get her done style. One other thing, test fit, as you don't want old parts to not fit anymore because of the bracing in the way now.
