Not exactly portable...though it could have been.........
We considered the time frame we had to work with, and whether to put up
a temporary shop, and move south....taking the shop with us. In the end, though
we chose to stay here for the forseeable future....
The new machine shed is anchored to a 6"thk steel re-enforced concrete pad which should hold
up OK to some hand forging as well as resist damage from forging scale, and oil spills etc.....
The same building, with a wood floor, and skids would probably have been movable....this one isn't...
it's guaranteed to hold against 140 MPH winds..!...(I'm willing to not test that..! )
Anyhow...It's small....tight....and plans are that the new process/shop will be quite efficient......