I gave up with the handle bar stem, it wasn't budging, despite using the tips I found on the forum. So I widened the hold in the body and it popped out. Not sure how i'm going to get it back in mind!
Removing the handlebar stem is potentially the most frustrating part as the parts can rust themselves together.
Now that the body is off you should be able to apply some heat to the stem without fear of melting the shell
I placed a chassis upside down on a vice secured to a large workbench and used a hammer, and large screwdriver as a drift, to hammer the stem out after it had been heated. The vice was used to support the chassis at the other end of the stem.
You have to be careful when doing this as it is very easy to damage the soft metal of the chassis
I was inspecting the wiring.. Seems pretty simple.. However there were a few loose wires some which just end and others that have spade terminals on them.. Are they additional for wiring in the horn / indicators etc or are they detached from somewhere. If so I can't see where they come from.
You're correct - the loose connections are for the other accessories.
As for batteries, the debate on car versus leisure batteries continues...
There are several threads on the subject