Girty what a gash!
Girty what a gash!
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How would you decipher these drains? They aren't (yet connected) to anything, but they obviously had something in mind.
I'm assuming gravel pit on the left was for a main water line.
#2 is (obviously) for a toilet.
#3 - Shower?
#1 - The only popular in some places sink behind the toilet?

Looks like you're cross-furring with 1x4's on the flat?Hustlin to get all of the girts up.
2x4's. Pretty common practice for post-frames.Looks like you're cross-furring with 1x4's on the flat?
Consider using 20 ga. DWC (hat channel) instead. Far more rigid, won't flex in the middle like the 1x's will over that long a span.
#4 could be another vent or stub up for the sink drain.
#4, vent for the toilet? Remove the caps from #2 and #4 and run a fish tape down 4 and watch for it in #2Back to plumbing... Did some digging.
1 - Shower
2 - Toilet
3 - Vent
4 - WTF
Also a guess, that the small pit with no plumbing would have been a sink? Perhaps a sink outside of the bathroom? But no plumbing there...
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