You have to decide the method and visualize the things while creating the CAD models on your own. There can be many ways you can create the same model or features in the model.
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There are many solutions to each modelling problem.
Try to remove all of the radii from the drawing to see what the basic form will be. Then start working on it.
Even if we told you how we would do it - you'd probably have as many solutions as there are users and it could happen none would suit your modelling style.