Internal end cap 5" for tapered pipe

This is for the project on my site for making a internal end cap for a 5" tapered pipe in "Preparing for buoyancy test" with 6 bolt holes.

This slopes into a pipe to secure equipment in a water tight pipe. to get the bottom part to this just stop the print before it's starts the top part.

This is designed to be used with Flexible Cap, ID 5.5632, Length 6.07 Inch http://www.amazon.com/gp/product/B0078RT7KW/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

I used 'The Hillman Group 4-Count #8