AutoCAD Civil 3D :: Revit Structure For Cut And Cover Tunnel

We are currently designing a Highways project which includes a cut and cover Tunnel (dual 3 lane through goes underneath a signalized at grade junction). Navisworks will be used for clash detection of all disciplines. To clarify the cut and cover structure will be similar to a large box culvert. Although new to the software; the Highways team will be undertaking the Civil Highways design in Civil 3D.

My question is - what is the best Autodesk solution for the structure and associated retaining walls? Note at this stage we are unsure what all of the design components will be (e.g. pump room for drainage etc). Previously the Structures team would have produced a 2D design (however 3D modeling is a requirement).

I have seen on the internet Civil 3D and Revit Structures being used interactively (although it appeared to be incorporating bridges only). Is Civil 3D able to affectively model this structure and retaining walls within the subassembly composer? Or is the question more to do with how the Structures team will complete their design (i.e. reinforcement detailing / scheduling etc).