Regarding rear suspension integration, it wont be that hard to put the suspension elements inside the 'bell housing' IMO. This old Bar Honda Gbox has done it, and only the heave damper stayed outside.
https://i.imgur.com/85K4JOR.jpg
@DawnTreaderEng
Yes the turbine will occupy a big part of that space. But take a look at this 2014 Lotus gearbox. It's bell housing had to host a full turbo, not just a turbine, but still, the suspension elements (missing here) sat behind the turbine and exhaust pipes.
https://i.imgur.com/85K4JOR.jpg
The split turbo obviously needs a smaller recess in the bell housing, so the inboard suspensions should have more space