Nano Barn/Macro Shed...

We need a shed for our urban nano-farm(Did I just coin a term? I doubt it..).
We need it cheap .
I am no builder of structures, I generally work on their guts(plumbing, electrical etc.)
I am inclined to try to score the carport my F.I.L. is hording, top it with metal and or translucent plastic, and infill in the sides as needed(IBC for water catchment, translucent plastic for solar gain, awning/ shutters for shade/ventilation/ security.
The foundation/floor could be a deck set upon concrete piers, I think I could pull that off...
The building would house tools, feed and a blacksmithing forge at least. Maybe starts and overwintering plants...
We only plan for a few animals at best, and I think they will be living out side the building envelope if their homes are even close to this building.
We don't want to over do it, trying to include too many functions, or being too "innovative" (crazy!) with the design, yet this whole yard is about our chance to do something different.

So, any ideas, pointers, disaster stories?

This is our lot btw:

We plan on putting it in the back on the left, not a lot of sun back there, saving the sunny spaces for plants..

First: get the zoning/permit rules figured out. Probably your biggest issue. setbacks and easements can ruin your plans in a hurry.

If allowed, metal carports are easy and rugged roofing solutions and perfect for smithing (fireproof!). Most of them come with metal skids for foundations, just a few big rebar pins to hold it in place. They go for $700 here, ASSEMBLED on site. Cheaper if you just buy it.

Floor should be packed gravel, no footers or piers needed. Pull off the sod and topsoil to use it in the garden, then backfill with whatever to get it higher than the surrounding ground to stay dry.

CALL BEFORE YOU DIG!!! or put stakes in the ground. It is really surprising where they run cables sometimes, or how shallow they are (like they just laid them on the ground and put sod on top). I had a friend knock out the neighborhood cable planting a tree--not with the tree hole, but one of the stakes he pounded in!

Great advice, especially the gravel floor-I might even run a RMH exhaust through the gravel!