Using Ana's plan for a simple sewing table, I modified it to meet the needs of my daughter.
I only used 1 wing instead of two and made a brace that folds away under the leaf. On second thought I added a safety leg and foot to keep the table from tipping when the sewing machine is on top of the leaf.
I trimmed out everything but the leaf with 1 x 2 pine.
The top (with leaf raised) is 31 x 46 inches of work space.
Water based polyurethane on the top only, applied with a brush.