Sparked by a brew in a bag discussion, here is part duex of my portable design series.
First the pot would change to a single kettle with a full steaming basket.
Here is ow you could do AG with a single burner, single pot and single fermenter.
Basic setup this is all you need.
Heat all the water of to sparge temps plus a couple degrees for heat loss. Put grains in a grain bag inside steamer basket.
Transfer sparge water into fermenter and cover with a blanket or other insulation. Add ice cubes to the kettle to bring liquor to strike temps.
Put grain basket into mash and mash for desired schedule.
Raise basket out of wort and sparge with the liquor held in the fermenter.
Boil as usual.
Cool, and transfer back to fermenter.
I would have to figure out some way to vorlauf effectively but I don't see that as a big challenge.