Building a parametric bridge link

Hey Gang,

   i'm modelling a compound of three buildings with several bridges in-between linking adjacent floors.

i was hoping to make the whole thing parametric, so that i can control the location of the link by points on the curve (floor outline of each building)

And then GH would be responsible for cleaning up the intersections and fillet (smooth-en) the meeting points.

However i'm failing to get GH to do the trimming/filleting...

Can anyone help please...

Attached is the plan outlines and the part of the script concerning this process. Also attached is a sketch (done manually in Rhino) of what i'm hoping to achieve.

Any help is appreciated