Hi Bjarmi,
I'm in a similar situation, designing skids, frames, lifting equipment and conveyor systems. I model/draw the detailed fabrication drawings with parts list and export parts to cnc-cutting and machining.
VW MD does all this, and if you like me use only about 10% of you time on this, then VW MD does a OK job. But, if designing and drawing is what you do then VW MD is to lightweight, I think. VW MD does not give you much of mechanical tools over VW Architect, or VW Fundamentals for that matter. Go for Inventor or SolidWorks.
Off course this is a matter of total cost. You have to consider efficiency, training, operational cost and so forth.