We need people to post, instead of wanting others to post the information they are looking for.  So for example, you say we are missing on a tek with full info from growing and harvesting to extraction of mescaline? Well why dont you start one yourself?  Make a thread like "cactus, from seed to consumption full tek" .    Then you can start copy-pasting relevant information (and linking the references), and people can keep adding to it, until we eventually come up with a good structured tek for all steps. 

Even if you don't have great experience, you can always just start linking things and/or asking questions you cant find answers to, and then others can build up on it. This is much easier than expecting someone else to write it all from start to finish.

Or the same with anything else with mushrooms or any other substance you feel is missing.  Please help us, we need more people actively contributing