Just for starters assume it can have whatever cores you think it needs to hold up alone.
Then I will have questions based on what functional cores I want to put in it (including PVC conduits and their in/out ports for water/electrical passage)
I put similar post up last night I and saw it posted but it has disappeared…dont know if my post was not liked or what. But I thought this forum is inviting serious questions. I am damn serious.
Here is the forma, and the inverse is the mould (already built)
http://clip2net.com/clip/m178491/1377066212-clip-39kb.jpg