Cut away all wiring, what a mess. But please help me now!

So this was the mess before I started cutting:
 

My plan was to make this in to a classic racer style bike, so wanna get rid of all the switches on the handlebars, and leave out the blinkers. I'm gonna redo the full harnass, but had some questions about the base electrical system.
The starter relais was broken, so already have a new one for that. In the below pics there are two other things, I believe they're called a rectifier and a regulator.
 

I had the idea one of them, or both were faulty, because the bike had a few batteries destroyed in only 500km. Is there a good replacement for this devices, and is there a way to maybe keep them in original wiring plugs? And how do I install fuses? The previous owner cut away all safety thingies, and used only cable connectors. I'd love to get some normal safety back in.
So far the questions for the main power components.


Next up is the new wiring for the lights etc. I was planning on installing a 5 button bracket inside the bikini top, for lights, start and stop button, and empty out the handlebars. The left buttons are simple to remove, for they are on their own.. Right side is in one piece with the throttle handle, do you guys have a nice replace set fit for the 70's?
 

Other little question, I have a new Brembo front brake handle, but the clutch is old, is there a same style handle, for the cable controlled clutch?
 


And very very last, I noticed with stripping the bike, that the rear wheel is off set. That might be the problem for the chain touching the rear tire as well, how do I solve this easy?
 



Looking forward to all your advice and help!

Thanks in advance, Robert from NL

z1parts.net has nice handlebar switches if yours are beyond repair.
 

Might find help here  kzrider.com/forum/4-electrical/172746-19...mattylight?start=108