old clay sewer toilet connection

Hi
I am ripping apart an very tired old 1930's+ bathroom. The original toilet was an outhouse and connected to the sewer main. I would like to add a second toilet about 3 metres away within the house proper where three existing clay drain pipes exist at ground level. These serviced the bath and laundry. These are not vented points such being elsewhere and outside the structure of the house.
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I am wondering if the three drainage points (4") can be used as a connection point for the new toilet or may there be gully trap implications. I am about to remove the floor and excavate around the 3 points.:?


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