Here is a direct link to the many tech articles that BillaVista, Pirate's resident Tech Guru has either written, compiled or both. This is an outstanding bunch of technical information here and is well worth a look. This guy is widely respected in the whole 4x4 community for his expertise. There are also a large amount of downloadable technical reference charts and manuals here..bolt and steel specs, tube notching with a cut off ...as I said: a wealth of information. I have used this stuff as a reference for years...

http://www.pirate4x4.com/tech/