They probably will be fine with a graph paper sketch but it would also not hurt to provide pictures of the unit too seeing as how its already built. Most of the time it is a new unit and pics are not available yet. They often like to give input into your design when building a new one. Don't be afraid to ask questions because it shows your concern that you want to do things their way to work with them.
post edited by Chicnscoop - 2012/07/18 15:10:38