The exercise is quite simple and can be completed in a couple of steps. Perhaps, we can first start with solid combine feature and combine two sketches, that should give us a majority of the part that we wish to create. Secondary features like through holes, pad, pocket etc. can be made next.
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An alternative way might be that we create a solid with 60mm width and 46mm depth and 48mm height and then carve out material step by step that's not supposed to be there.