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Thus , all the information is available. Or not? Often it happens that new pictures and / or drawings are found that makes redesign easier.
If I have only photographs available I have to estimate the size of the component on basis of items from that same picture and of which I do know of all the dimensions.
Then the real work starts. Normally I start sketching the part in a flat perspective. Then I 'm going to shapen the part. Then, by making the holes and subtracting them from the part. Sometimes it is just like making the real part : First, a large piece of material and then drilling / milling / cutting holes in it. See animation below to reflect the operations.
