I also finished this project recently. It was started well over a year ago (yes, a year!). It's foam core cut into pieces, covered with unprinted newsprint paper (so the paint will have something to stick to), glued together, painted, and decorated. In all fairness I did make one for Mom & Dad last year for Christmas and I did finish that one in a month!
The inside: recognize anyone? heehee
The top: made from embossed aluminum foil
colored with alcohol inks