This is the last installment of a long design and learning process. Thanks to all of you who helped me on my way to this point. Below is the final solution and I would like to check with you if I selected the right fittings
The overall diagram is in the second picture attached to this question. I am building the green pipes now and the orange ones in the second step (when I renovate the main floor bathroom). This green segment is mostly dry vent. There is a drain portion from the new sink to the shower drain. Also there is a wet vent portion for the shower
The orange pipes are to be build in the second stage in order to connect the green vent to the upper part of the soil stack that works as vent for its upper segment
The yellow pipes are "good to have" but I think this should work without it. They might possible be required for the bottom level toilet which used to have a vertical dry vent where the grey pipe left over is (that segment will be capped and under the slab). That vertical segment was cut.
In the first picture I have numbered the fittings and below is their description.
❶,❷,❼ -sanitary tee
❸,❹,❻,❽ short 90 elbow
❺ 45 wye that connects the shower
❾ 90 elbow if they yellow segment is not built, sanitary tee if it is built ❿ 90 elbow if built
I have doubts regarding ❸ and ❹ as these points are prone to clogging These should be long elbows. While ❸ will be ok if it is like that ❹ will push the pipe to low and since I will be connecting to an existing pipe I will need to open the floor for a segment longer than I might want.
Do you see any errors with the above ?