Basement finish with bathroom

[TryingToPlumb]

Good day everyone- What a forum. Thanks for sharing all your knowledge and I am ready to learn. Glad to be here.

I am working on finishing my basement. I'm onto the bathroom plumbing. The builder looks to have somewhat roughed in for a bathroom. I've attached some pictures. I'm unsure what I am really dealing with and exactly what to do next.

1 - Guessing its the shower/tub drain and the shower fixture will go on the opposite wall. How high does the water supplies go for the stand up shower? This doesn't seem to be directly in the center of my framed out future shower. its offset to the right side a little.
2 - toilet drain? I screwed up and put the back wall 10.5" from the middle of the toilet drain. I saw I could get a 2" offset flange or a 10.5" toilet?
3- 2" Vent and vanity drain? I tried to draw in what I would tie into on the pic. How high above does the vent pipe tie in? Does the drain also tie in as I tried to draw in? How high does that go? Do I bring in the water supply right near it? I figured the drain would be on the center of the vanity and the supplies to the left and right.

Speaking of water supplies, I have the main supplies running along with the HVAC supply trunk, down the center of the basement. I'm probably about 15-20 feet away from the bathroom to tap in. Can I use PEX? Do I just bring a hot and cold over to the bathroom and the branch off from there for the shower and vanity and one cold for the toilet? Do these need to be a certain height or branched off a certain way?

I appreciate all the help I can get. Am I missing anything? I've never done a bathroom from kind of start to finish and I am really excited to get started and do it right and to code.

Thanks again!!

 

[Terry]

Reventing is done at 42" above the floor, six inches above the flood level of the highest fixture.
The lav looks to be venting both the toilet and the tub with 2".
They do make a shower pan with a drain on the end, or tubs come that way.
A 10" rough toilet can be installed at 9.25" from the finished wall. Everybody makes a 10" in addition to their standard 12" models.

For a bathroom water supply, a 1/2" hot will suffice, and the cold is either two 1/2" lines or a 3/4" that gets split.

 

[Sponsor]

 

[TryingToPlumb]

Thank you very much Terry! I have 3/4" cpvc water supply and I see the existing 1/2" cpvc supplies to the existing kitchen, bathrooms, ect.

How do I tee off the 3/4" cpvc to Pex? Or should I use cpvc for all the runs? Figured pex would be easier for me. Is there a T that goes from cpvc on one side to pex on the other? Does the toliet get its own line in this case? Its not too far to go and I figured I would run all 5 lines(2 shower, 2 vanity, 1 toliet) as pex home runs off the 3/4" main supply.

 

[TryingToPlumb]

Or thinking about this a little more, do I need to put in a cpvc T at the 3/4" main supply for each pex run and then use one of these cpvs to pex adapters? like this one at Home depot = 1/2 in. Brass PEX-A Barb x 1/2 in. CPVC Straight Adapter.

If so, Ill have to glue the T's in right? Will I have to have my water off until it cures/drys? What do you think of these push on(sharebite) fittings? I see some are hesitant to put in a wall that isnt accessible.