Hi Graham, welcome.
There is a lot of information in the archives on keris construction, so while you're waiting for some details try the search engine with various key words.
There will also be more info found here:
http://www.vikingsword.com/cgi-bin/U...assCookie=true
Also you should try to find a copy of The World Of The Javanese Keris
By Garrett and Bronwyn Solyum ; there are lots of step by step Photos of the forging and carving process.
Rick