To level the z carriage, I used a can of soup. The whole process is described at http://bukobot.com/jitsbuild-x-axis
. Scroll about halfway down the page until you see soup cans.
It's best to use one can of soup, not two. Move the can from one side to the other, adjusting each threaded rod until the can fits snugly on both sides.
Regarding the assembly manual: It takes a lot of time to write a really detailed one. The more time the Deezmaker guys spend doing that, the less time they have for doing things that only they can do, like assembling kits, dealing with supply chains, improving their printers, inventing new stuff. On the other hand, documentation can be written by users, while they assemble their own kits.
So that's what we did. We crowdsourced the v1 manual. Deezmaker didn't ask us to do it. A bunch of Bukobot Kickstarter supporters just did it. A reasonably complete assembly manual was ready by the time kit shipments was ramping up, just in time (jit!). While that was going on, Deezmaker concentrated on improving the printer, and shipping.
There's nothing to prevent v2 users from doing the same. For one example of how to do this, start here: http://bukobot.com/jitsbuild