I have 15 year old ratio's made of display tags set to wireframe with cubes.
for the back , side , top etc etc views.
I also have mannequins made of spheres for humans,dragons etc etc.

Got a back , side , top etc etc views to place drawings or photos on. jpgs.

Anyways the point is I have a lot of ratio tools.

Even have low polycount base meshes I've made over the years.
like The boxed hand ya saw on Chrome .

The point is no matter how you do it, lines,spheres,jpgs etc etc.
I would know the ratio before I started.

 

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance