My info is a bit off currently as I am not in game ATM, but it involves planning chalk and the carpenter thingy in Mariculture.
Same with Mariculture, except you can make stairs, walls(ala cobblestone walls), full blocks, and even RF storage cells, mimicking anything you have access to. Including a few things that look like ass but you can still use if you want to.
Now I'm really interested. I haven't used Mariculture yet, so I don't know much about it and what can be done with it.