Peter Alway Saturn IV Build, Part 3, Small Details

The four Antennas (Part U) are made from the discarded centers of the adapter rings.
Whether die-cut or laser cut you'll want to square up the angled cuts on the outside.
If your center piece is die-cut, there might be some buckling of the card stock on on side. Sand off the raised areas.
This will leave you with some rough edges.

The flat top and bottom of the disk got a coat of medium CA applied with a Q-tip. This hardened up the card stock for smooth sanding.
I took two applications of CA and sanding to get them smooth.
On the left is the top smooth side, on the right is the backside when the raised edge was sanded down.

Set the disk over the pattern and extended pencil lines.
Mark the disk for cutting with a sharp pencil and straightedge.

These are small and will want to move when cutting.
Score the cut lines first, don't try to cut through on the first pass.
After the first cuts are scored you could move the straightedge and use the knife by itself to cut all the way through.
Take your time, this card stock is hard!