Pierre, get hold of Melvyn Hisc--ks book on making your own electric guitar, he covers neck throughs in there. Not only a good read but an invaluable resource. If you need any further help with hardware, etc, supplies in the UK, email me. If you have any technical questions a good resource is the Musical Instrument Maker's Forum (
www.mimf.com) it's free to join and there are a lot of very knowledgeable folk on there who are happy to advise.