Firstly my brother managed to get the gearbox insides lined up correctly and hence the gearbox has gone together and is working well. The levers were also chrome plated, which has made a huge difference.
The clutch basket was adjusted and with the new clutch plates has been re-assembled.
Here are some pics:
The clear coating put over the polished casings is not working and is starting to "craze" so will
need to be removed and left as polished.
My brother was also able to vapour blast and clean up the casings of the AMAL Carb, which is a great improvement.
Now need to order a carb refurb. kit.