Re: pollen trap building - pine, cedar, ?
I hate to put ice on your fire...but you bought a trap that is not very good and may actually harm your bees.
To address the latter point first. In the 1950's and 1960's pollen traps were properly criticized for reducing both pollen available to the larvae and for reducing the honey production. After a lot of investigation the researchers determined that such reductions in pollen and honey were due to the fact that the bees had to go throrugh the pollen trap twice. Once to get into the brood nest, and again to leave to forage. The trap you bought has such requirements.
The trap also had several other problems...the perforated metal screen has the punch side 'down', which means lots of bee wings will be lost before the burrs are removed. Any rain getting into the drawer will contaminate pollen, which will then be forever lost. (Other traps avoid this by design.) The drawer is made of window screen which will quickly rip. There is no drone escape which will not enable the bees to use it to enter the hive.
Look for the newer designs that avoid all these problems...and more.
Lloyd Spear, Owner of Ross Rounds, Inc. Manufacturers of round section comb equipment and Sundance Pollen Traps.