[Aertyn]

I used Garden edgers from Bunnings Warehouse, (they snap together, and can be made bigger or large, depends on what you are after) I also bought a small piece of wire (square size 1cm or 1/2 inch) and made a roof. I'd suggest plastic as a run, or spare grids, as it can be easily packed up and stored in a small place

It's fine for it to be all on the grass.

I'd suggest not, as it makes it harder for the pigs to get to the grass (we had to cover the bottom with chicken wire after our female gave birth, and it made it really hard for them them to acess the grass, I had to go out and pull it through the gaps)

I'd suggest making it with a roof (just in case), I grab a towel and lay down and do Sudoku puzzles when they are out, they sometimes wander over and have a bit of a sniff, but your only hindering eating room (in their eyes anyway)

Unless they are dirty, or have muddy feet (avoid places that are damp so the really shouldn't), they don't need bathing.

As Hay is just dried Grass, they don't need Hay in their as well, I put their food in with them once, but they didn't touch it (so much grass, so little time!)

Don't put them in direct sunlight, or if you have to, throw a towel over one side that they can rest under, if it's a warm day with a beeze, I spray the towel with a water sprayer thing, and make sure it's facing so that the wind can go through the towel and into the run (I don't like using a pigloo as it takes up too much room), and make sure the grass area you pick doesn't get frequented by animals, (sometimes it's unavoidable, if you think an anmail has gone to the toilet there, spray it with some water, wait and hour or so, and it should have washed off the grass by then)

Hope I've helped you.