Fitting new soil pipe to access chamber

Hi all. Not sure if it's a plumbers job or another trade but thought I'd ask.

I am installing a new toilet downstairs next to an outside wall. There is a 3 way inspection/access chamber about 1.5 metres outside this point which I plan on going into. It has one inlet in use from the upstairs WC and the other capped off.

I plan on going from the toilet out the wall, elbow down, dig a trench leading to the chamber, elbow to horizontal (having the correct fall) and run it to the spare inlet on the chamber and connect.

Does all that sound right?
Is there anything I've missed?
Anything I need to be aware or careful of?
Can I just elbow down or will I need some sort of breather?

Any help would be welcome. Thank you.
 

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