I usually try to do things at my own pace. To answer your question the body is about a fingers length and the head piece is a little smaller. Also, thank you!That's pretty amazing. I'm not exactly sure what the scale of it is but I do like how it's weaving through the ground.
Also, I wouldn't recommend stressing yourself if you want to get Skeletron before 1.4 releases, but that's just me. Keep it up!