Please give a look at this diagram. THX!

Another bathroom reno includes: removal of cast iron tub & sink. Installation of double sink vanity. I removed all the horrid, 60+ year old galvanized. Here's my diagram for new plumbing making as much use of existing stud holes. The original sink and tub drained into the 3" toilet waste; I'll be using that.
Is this Kosher? Please evaluate. Thank you in advance.
Geoff