The render I posted was just a 30 second hack-together representation. I haven't begun the printing prep as of yet. However, here's a quick write up on how I intend for this model to be constructed.
The model will be printed in sections, each sliding over 2-3 pieces of pvc tubing. Having dry-fit the assembly, adhere all the sections together leaving the butt separate. Fill both halves with 2 part expanding ridge foam (going this route allows you to use significantly less printing material both cutting cost and print time). Adhere the butt to rest of the assembly.
Personally, I would prefer a fiberglass model so I would go one step further and make a slosh-mold.