Sheetrock will be your cheapest option and it should be fine. I have seen it used in lots of questionable places with few issues. What is the worst that could happen, a few small cracks you repair years down the road?
Stained wood strips look great but are a lot more money. However, they could...
Go back and look at the plan in the first post. The plywood is "a continuous nailer" for the rat wall barrier. So the plywood is just a nailer. I suspect metal flashing is the actual rat wall barrier.
I would ask about laying hardware cloth (wire mesh with 1/2" square holes) on top of the joists with the plywood floor on top of that. Then you just nail through both the plywood and hardware cloth. No rat is getting through that. And if you decide to move the shed you don't have to deal with a...
I would carefully excavated all the way around the pipe to inspect. Assuming to is just the crack you see, I would clean both the plastic and clay pipe. Then caulk the crack.
Then, I would wrap fiberglass tape all around both, embedding resin on each layer. Build up a 1/4" thick bandage of...
If you are worried, put a epoxy sealer that will stand up to gas and oil ON TOP of the slab.
That is way better than trapping gasoline between a sheet of plastic and the bottom of the slab.
1. Dehumidifier. I have lots of machine tools and now they don't rust. I also learned not to open the overhead door when cool inside and warmer and humid outside.
2. Cable TV
An aluminum ridge vent is pretty easy to install. Just cut 3" slot wide in the shingles cap and nail it on, caulking the nail tops. Otherwise put in a tempature controlled fan. A radiant barrier with no insulation and no a/c is likely worthless. In my garage I run a dehumidifier so my machine...
The base coats for stucco/parging is very important. Find the high spot first. Work in sections. Set straight edges (angle iron?) about four feet apart that you can use to screed from. Attach them with anchor screws. Use shims to set the straight edges plumb 1/4" proud of the high spot. Rough...
To finish the stair stone wall just stucco/parge it flat to the highest point and paint it. It will just look like drywall. Unless you are talented, get a pro to get a perfectly flat smooth surface.