Here in Australia..
This is not how we do it ,think 100mm is alittle over kill! More digging for you! But well with in the standards...
"This is how I would do it". ..not sure if your gonna understand the terminology? Coooooooos having a hard time understanding yours..
Think I know what your asking for is another way? (For the shower)
Working back from shower to main sewer working with 100mm...(only)
100mm riser (straight 100mm pipe about 300mm long)( Capped for the grate)
100mm 4way riser for (Waste pipes)
100mm gully (water seal)
100mm I.O 45 degree (Case of blockage)
100mm Y junction off the sewer line... Done!
Hope this helps and what you were asking for???