I made three different items; a Water tower with track, a Helicopter landing bridge, and a Buffer.
I used generic wood slats and rods from a craft store to make the structures, plus a wooden bead for the water tower. I glued them together with wood glue, sanded them a whole bunch, painted them with craft paint, then gave them a coat of semi-gloss polyurethane.
For the painting, I used blue painters tape to cover the bases so they could stay unpainted. I painted the rest white, then added the highlight colors as needed.
Helicopter Landing Bridge: