keith, that's what I've been doing too. And previously, for my work, extruding in the spline modeler was fine. But with C6's champher tool - which adds a level of realism that will take my projects to the next level - converting spline objects into vertex objects makes for a host of issues with said tool.

So, right now, I'm deleting the extruded section, emptying the polys, deleting all those blasted line segments, then welding the segments, point by point, then extruding... whew! I'm beat just typing this out.