Which layout works best for basement bathroom? 1950s house Toronto Canada

[GOMBU]

Planning on DIYing a 3 piece bathroom in my basement and wondering if one of these layouts and drainage plans are a better option over the other or if there is anything fundamentally wrong about them. Thanks in advance

 

[Jeff H Young]

remove old 2 inch possibly the 4x4x2 wye as well just a potential leak.
4x4x3 wye to w/c along the way a 3x3x2 wye withe the 2 ich pointed toward center of lav 90 up through slab. a 2 inch wye befor the lav will pick up shower with 2 inch p trap below slab

 

[Sponsor]

 

[wintersoldier]

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