Renovating ground floor cloakroom - Questions!

[Dugbuz]

*New to the forum and not DIY literate...pls bear with me....*

So I've got a bee in my bonnet and decided to try and re-hash the downstairs cloakroom on my own based on previous experience of being let down by various tradesmen over the years. Im not stupid - but it appears I have been quite gullible....

This is likely going to be a thread of questions as I transition through the project, so I dearly hope some of the more patient characters on here will give me some advice, if you please

Ill tell you where Im at - Ive stripped the room bare....down to the concrete floor and exposed all the plumbing/pipework, found a soil stack here is the pic:

https://www.evernote.com/l/ALw6oLTscr9K_qITm_7Ml3H8kr7eg7jLRsg

@mods you said I can copy & paste, I can't get it to work....

1st Question is - do I need that soil stack? Its a fully internal room in the middle of the house - no windows, and no external walls - can I fix the new toilet directly into the 'crap hole' and remove all that plastic palaver?

........told you Im basic

 

[dilalio]

The "stack" is a "stub stack" and has an air admittance valve on the top (durgo). Likely there for a reason so you'd need to incorporate one into a new setup.
Hopefully the bottom most fitting is pushfit (ring seal) and you can pull the whole lot out of the floor... Everything else is solvent weld (glued) and cannot be reused.
If the lowest fitting is solvent welded into the floor, you'll be having grief to remove it and still leave something to reconnect new setup to.

It could definitely do with a tidy up, but depends on your desired arrangement and choice of sanitaryware.

 

[Madrab]