This site is worth a visit. You can get the bits n' pieces from places like Southall or off the Web.
http://piers.thompson.users.btopenworld.com/index.html (http://piers.thompson.users.btopenworld.com/index.html)
I will have a look see if I have some other info/links.
CP
Yes, here is another one from my files, but not for the faint hearted. Not sure if this site is still going.
http://www.poptastic.com/build.php?tt_page=article&article=3 (http://www.poptastic.com/build.php?tt_page=article&article=3)
CP