That’s good work, but the time spend modeling something that you know what the result should be, can’t be compared with the time spent creating something from scratch.
Parametric and/or history-based CAD software (M-CAD from now on) are the obvious choice in a lot of projects. To the point that using something else make no sense at all, and I often use SolidWorks or SolidEdge.
But you have to know the advantages and pitfalls of each species… Besides the obvious strengths of each, such as the ease of adding and editing fillets or shelling for one, and the creation and analysis of flowing surfaces in the other, in M-CAD you have to carefully plan projects of even the smallest complexity. You can try and predict what parameters or features you’ll most likely want to change in the future, and then modifications and iterations are a breeze. But sometimes it’s a change you did not anticipate and you won’t be able to modify your model (circular references for example, or features onto which most of the model is built but has to be drastically changed), the only way forward is to start over and than can mean several weeks of work.