Thanks Michael. I am NOT going to get the mixture. I am going to buy only pine for a few bucks more. Thanks again for your quick and informative response. I ask advice from experts like you...and no one else. I will send you some photos when I have the time. The ladder roost only has two 2x3 boards which is not what I wanted but my architect was so reasonable and committed that I didn't want to appear critical...and he hasn't any more time to spare. The boards will have to do. I suppose I could always add another in the future. I will be in touch! Thanks a million!
You're welcome. I'll look forward to seeing your pics. )