It really depends on what your intent is with the model. If you want to have it manufactured, that is a perfect case for a weldment where it creates a cut list for each specific member, in that case you just create the base sketch(es) and add the appropriate structural members.
If you just want to have the envelope package for whatever reason, then I guess you could carry on with the way you are doing it.
Some advice, make sure your base sketches are all defined and dimensioned appropriately.
I would have created that part with a symmetric plane.