Wow, what an imagination! I didn't mean to create an exact replica of that image, but rather use it as a basis. And it's hard to say what Necromancers are capable of. Also, a wide bone doesn't necessarily mean it's strong. It can be narrow, but with a higher density and strength.

That's true, but we're going with stereotypes – the thicker the bone, the harder it is to break. I liked the golem's torso in the game about Iratus – lots of skulls and protruding bones, it's immediately clear that it was assembled from several corpses, but the arms and legs are ordinary, even though they're large. I think that if there are large skeletons, they should just be resurrected, rather than building a bone construct. It's better to reinforce it with metal later.

Added 3 minutes later
I'm interested in creating a golem with animal bones, attaching a deer skull, a gray wolf... adding more skulls. This is a standard problem with monsters – it's not clear how to improve them, and even more so, how to create an alternate upgrade.