Final Greenhouse Steps

The Greenhouse plan has been very hot lately.
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Peeps.... please stop asking me to build one for you.  I'm going to test case one on the Sundance property and see how it goes, then I will consider exporting my expertise to the general public.... which is you.
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At Sundance, due to lot configurations, setbacks, topography, and ledge outcroppings, I really can only place it in a certain spot on the lot.   But Zoning won't be a problem at the present 12'x24' proposed size.
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The only issue left is whether the structure can be permitted as designed under the code.  I want the four foot open panel span of the polycarbonate panels if possible, otherwise, I would have to add a stud in the middle of each which would create a 24" on center framing system, which is an acceptable alternative.
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And I want to see if the pressure treated wall plate contact with the compacted soil at ground as well as a pervious dirt floor will fly.   I'm pretty sure that the Building Department will approve the PT issue, because I have addressed this previously with a garage that I proposed, and the dirt floor should be ok given the greenhouse use.
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So with a permit in hand, there is nothing to it but to do it... right???? 
Wrong, Kemosabe.
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I have a whole list of stuff to do with the existing property leading up to Katelyn's wedding, some of which come with a decent pricetag,  before I can indulge in this project for myself.