Hi Allen et al: Plywood is more dimensionally stable than solid timber. My biscuit joined plywood supers are the same size and shape as they were originally. Some are now about 7 years old. I would not go back to solid wood. The commercial frames are all over the place in length. For a given box I can find frames that will not fit in, some that are right and some that fall through. The ones that fall through are Pierco one piece frames which are shorter than any of my wood ones. They fit nicely in some commercial boxes that were made with 7/8 " thick material. Best regards Donald Aitken --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.551 / Virus Database: 343 - Release Date: 11/12/2003 :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::