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Second, I disagree with the comments made that Jesus looks too muscular. Consider the facts; they had a much better diet than we do today (I'm not going to fight this with anyone, do the research). From all the walking (they didn't hop on the bus) I think that most people of the time would have very good physiques (look at people in the manufacturing centers of China - most of these people have bodies that westerners would kill for - and it's only because they have a "clean" diet and walk or bicycle everywhere!). In fact, I don't think that he is looking, for want of a better term, "ripped" enough. He has gone through a considerable amount of physical exertion by the time he had been crucified; it is easy to believe that he would have been in severe dehydration. This would cause the skin to become very thin and tight over the muscles. Perhaps the musculature would not have been so "pronounced" (large), but I in fact think one would look more like an anatomical model more than a cover model... NOW, I also consider that this is a formidable modeling task (not one I would even think about attempting...

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My two cents; I think the crucifixion scene is *mostly* accurate. The upright post (or stipes), was generally permanently fixed in the ground. The condemned man was forced to carry the horizontal (patibulum) bar, weighing about 110 pounds. There were two forms of "crosses" in use, the St. Anthony's cross, shaped like a "T" (as you have it here) and the Latin Cross "t" where the vertical part rises above the horizontal part. It's stated that the "inscription" was "placed over his head" drawing the conclusion that it was the St. Anthony's cross that was used. Lastly, it is unlikely that nails were used in the patibulum (one would have to first drive them in, and then pull them out = more work...). A simple slot was used.
Your use of the "seat" post is good, but perhaps a bit oversized. This was used to EXTEND the torture. As such, it was very small, just allowing one to have something to "push" against to get a fresh lung-full of air. As stated, the idea behind crucifixion was to suffocate the person slowly.
The cross was not very high off the ground; just high enough that the person's feet did not touch the ground. Again, this makes sense from the perspective that the person carrying out the execution would want to do as little work as possible.
Lastly, the "spear" was thrust into his body to make sure he was dead. By most accounts, this was done through the heart (according to the Gospel -"And immediately there came out blood and water"). Most likely this was the fluid surrounding the heart (the pericardium). Therefore, the wound should be on the left side of the body, not as depicted here.
Thanks for sharing your visualization and prompting a great discussion!
The most exciting phrase to hear in science, the one that heralds new discoveries, is not "Eureka!" but "That's funny ..."
Isaac Asimov