Rambetter's Pipe generator can only generate perfect curves, so I think it is ok if you only make bevel from square brushes for your curved corners. May be Markinho can confirm but if you want to create slim/fat curves, you can play around with the extrude parameters and then cut the generated brush, but it seemed to me not very convenient.
I did some small modifications of rambetter's pipe generator to generate bezier curves instead of circular section as an experiment:
starting from a bevel patch:
you need to read from you patch the coordinate of the end points (in the example 0,0 and 384, 192) and of the control point (the pink one visible when switching to vertex mode, in the example 296, 16)
given a thickness (64) and height (128), and subdivision numbers for the wall, you can easily generate a best fitting wall: here for 3 subsections:
and for 8 subdivision
If you are interrested I can look into generating the slick brushes for that kind of curves.