I went to Home Depot today to see if I could find some "Baltic Birch" plywood and I did not see anything that had that name, nor did the guy that worked there know anything about it. They did have 2 X 4 sheets of Birch plywood (~16.00 / sheet) that is intended for "architectural applications". Looking at all 4 cut edges, there were no apparent voids like I saw occasionally on the other plywood that they had....is this the right stuff? If I build an IB manifold, I want to use plywood since the box will be cantilevered from wall studs and 2 Tempests are not exactly light. MDF will not cut it in this application. I have not tried the custom woodworking shops in the area to find out where to get it. Buying it at HD would just be easier, and maybe cheaper. Thanks.