Hi David, one possible approach:

Base surfaces built by Loft and some surface control point tweaking:




Surface blend between edges:




Side profile then Trim:





Another profile then sweep 2 rails:






This a sort of alternate "trim and blend" NURBS workflow which can used for stylized objects that may be difficult to create with the usual method of just using boolean cuts on a base shape. This style of NURBS modeling tends to be more complex and has a higher learning curve but it can work for more swoopy industrial design type shapes.

When you're heavily using this style of modeling the advantages of NURBS modeling are not as pronounced (as compared to sub-d modeling) as for things created using more solid modeling operations like booleans. So if your model requires a whole lot of this type of modeling you should possibly think about whether it's really better suited for doing in sub-d instead.

- Michael