Adding Toilet and Sink to Basement

[andrewtwallace72]

We live in a pretty basic bungalow home with only one bathroom. I want to install a basement toilet and sink. As there is a utility sink I the basement, the most important part is the toilet. The space s super tight, so any horizontal bends would make it near impossible. I am trying to avoid bends and line up a perfect straight shot.

I made a diagram of plumbing for the house and added a few photos. The only place I think a toilet would physically fit is about 8 feet from the 4" Clean Out cap. This cap is 10" on center off the ground. I have the ability to completely do the plumbing and then recreate the wall as it's just a basement retreat, so not real construction constraints beyond just a small amount of space.
Here are things I wonder about, but I bet there’s more I haven’t even considered so appreciate any advice. Also I have zero ego here, so feel free to let me know I am crazy or likely to destroy our house.

1. Can I tie the toiler directly into the drain pipe at the clean out cap?
2. If I can tie in that way, do I need to make another clean out cap? I may not have the space to do this if clean out caps have to be at the very end of a run (please excuse my ignorance)
3. Based on the plumbing diagram, do I need to vent this toilet, or would the existing vent suffice?
4. If I do need to vent, can a vent be done near ground level? I do have access to a discrete exterior wall where this could go.
5. Does the toilet outlet need to be higher or level with the drain pipe?
6. Would a rear discharge floor mount toilet do the trick better so I don’t have to have a tower like throne?
7. If I do a sink, where do I drain it? There is an unused capped 2” tee (I think that’s the word) into the drain pipe I think I could use.
8. Wall mount toilets look like a hassle, but seem to afford the ability to make that straight shot into the drain pipe, but sometimes I see them on craigslist. Should I avoid like the plague?

Thanks again for any advice! Andy

 

[CT18]

Yes your sanitary needs to be below the toilet unless you get a pumped set up, like saniflo. Does the sewer line go down below the basement floor over in the corner

 

[andrewtwallace72]

Yes your sanitary needs to be below the toilet unless you get a pumped set up, like saniflo. Does the sewer line go down below the basement floor over in the corner

Hi CT - thanks for your reply. Yes it eventually goes down into the floor near the street side. I hope to remove that end cap, thread on an extension with a Y joiner to tie into the sanitary. This way I still have my cleanup accessible (admittedly 6 feet in front of the last toilet if that's ok).
Do you happen to know if this would be considered properly vented? Thanks for any advice or insights!