Thanks for the comments. I haven't really looked into putting in another stove, but you have a good point. I had kind of counted it out, but maybe it's time for a little research. The pic was taken in between floor coats and is grayer and not quite as slick as it appears here.
I've been debating with myself about a welding location for a while- no big hurry as I don't have any equipment yet- I can taste it though.

If it were in the shop I'd definitely put something down on the floor and close the sides and back off. Outside on the driveway would be preferable, but the flat area is pretty short before it starts down the hill, plus I get a lot of debris from the pine trees- so I have to be careful not to set the place on fire.
There's a photo of the outside in the "test" section.