conduit entering crawlspace under bathroom addition, over to Jbox.
Jbox under bathroom
romex from Jbox to hole in foundation to under back addition
Available abandoned hole from addition crawlspace to original crawlspace. About 5 feet from garage foundation. might work, and avoid PEX next to water line holes.
Insulated PEX line, large old (ababdoned?) galvanized water line, and conduit from addition crawlspace heading into original crawlspace
gas line headed to abandoned wall heater in original garage, now master. I think the higher galvanized line is electrical conduit from jBox under bathroom addition.
unused, but perhaps pressurized gas line to old wall furnace in garage/master
corner of addition crawlspace where water and electrical come through foundation to under bathroom addition
conduit and water lines from original crawlspace, where they come in from addition crawlspace
conduit heading up to old fuse box. note that there is one large old woven romex coming out of the fusebox. best guess is that it was range plug, and was ababdoned.
old fuse box seems to have a ground line to abandoned galvanized water line
ground, conduit, and old romex heading to old fuse box
capilary hallway only about 30 inches wide. Would it be code to put sub-panel there? Furnace is mostly under this hallway. Might not be terrible to run conduit down over edge of furnace, perhaps bend to point over furnace to feed any new wires in original crawlspace.

Note that duct work does poke through original crawlspace to under floor of garage/master. might be able to run romex along this duct. We could also drill new line next to this duct, up into wall of garage/master for new lines from panel over original crawlspace.

would it be code to put sub-panel in this little alcove leading towards north bedroom?
cheap solution. Run one new line through conduit to jBox under bathroom. Run romex from jBox into garage/master. Add new outlets from one new line in garage/master, and drop new grounds to old outlets, upgrading them.
misc other stuff
connection from PEX to broken spigot outside bathroom