Quick look before the wife and kid get home:
You have a lot of overkill in your venting.
3" sanitary to the toilets, if you need to indivually vent them then use 2" vents.
2" line and trap for the shower, 1-1/2" line and trap for the tub.
SewerRatz is familiar with Chicago codes, you might have some distance issues with the tub.
Your horizontal vents are too low I think - 42" is the standard, 6" above flood rim of the highest fixture.
Sorry if my thoughts are haphazard right now, time constraints.
For the toilets you can't use vents backwards (photo4)