Looks like we are thinking about the same thing.
I have a 3D printer and found a file done by Scottdee who is a member here, of the ESTES Mercury-Atlas. All I needed was the body tube. After reading some threads here I decided to cut down an old Saturn V tube. You can buy one from ESTES. The first thing I did was make a mandrel of the original Mercury-Atlas tube to help form the Saturn V tube around.
I cut the Saturn tube formed it around the mandrel and glued it up. Did this over the weekend still have to glue the strip of tubing on the inside for strength.

It's nice to know if this one crashes and burns I have the ability to build another one.

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