To make the round ends, bend an uncut noodle around the bottom of the cement form. Cut the noodle ends until it fits snuggly around the cement form.

When you have the correct size of the round end, duct tape the ends of the uncut noodle together.
You will need to make three round ends/rings – two using the same size noodles as you used on the column and one larger.

Place the rings onto the ends of the column. One end should have two rings and one end should have one ring.
Outline the circumference of each end ring onto the 12″x12″ wooden pieces.
Apply contact cement inside the circumference marks on the wood.
Apply contact cement onto the bottom of each end ring.
Allow to dry at least 4 hours.

Place the end ring onto the wood pieces. This is your top and bottom.
Apply caulk where each piece of noodle meets the next piece of noodle.
Apply caulk where the round piece of noodle meets the wooden piece.

As you are applying the caulk, wet your finger and smooth out the caulk lines. Continue to caulk the entire column.
Allow drying.

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source:hometalk