Robert,
I am sorry, I tend to give short off the cuff answers and regret it later. Let me try to answer your question again.
ALL kit manufactures try to use specific density woods in critical areas in their kits. Some are VERY good at it and some are not. The manufactures who make the fewest kits are far better than those of us who mass produce kits. When you are making a dozen kits a year you have the time to pick and choose the lumber that you want to put into your kits, also the higher priced kits have a much better wood selection.
Here, at Black Hawk Models, we produce over 100 kits per month. This requires that we purchase large quantities of wood. When we purchase wood we tell them the size, quantity and type of wood we want, in general we look for a medium grade, not to light and not to heavy. Since we are not making contest models or expensive model kits we never ask for contest grade balsa. However do to the the quantity of wood that we buy we do get several different grades. When we are making kits we try to pick the wood that is best suited for the part that we are making, this doesn't always happen. Recently we fell three weeks behind on filling orders, at times like these we only try to not use a wood that will weaken or be unsuitable for the part in the kit. I wish that we had the time and space to sort the wood for each part that we are making but that is not going to happen.
The kits that we produce are low cost and we give high quality for the dollar. If we were to double or triple the price of our kits we could afford to spend more time on each kit and since we would sell a lot fewer kits we would have the time. We, the whole crew at Black Hawk Models, are quite proud of the kits that we make.
Well that is it, the main point is that we ALL try to put the best wood into the kits we make.
Larry
This statement is made to keep me from being hung by John, Eric, Ray, Larry, Bill or any other kit manufactures.