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Yes, more fill, appears he only has half the thickness of the material welded



To be honest, that's the first thing I noticed from the close-up pictures but I didn't say anything. This is very common, I've seen it in aftermarket control arms, k-frames, and roll bars and cages. For structural components such as these the welds need to be engineered in material and geometry just like anything else. This simply means that the weld material and thickness need to be chosen to handle the loads and stresses they are, or might be, exposed to.

In these days of the internet you have to provide good (and pretty) pictures of your product to gain market acceptance. This need for prettiness hasn't necessarily been good for quality. I strongly encourage anyone thinking of making this kind of product to pick up a basic Mechanical Engineering text with a section on weld design and read that section until you understand it. I know, that's not gonna happen.