Here`s my idea for a build using a metal plate washboard as the lid on a old large silverware box. I`m going with a 4 string dulci [ 2 melody strings ], 6 string harp [ using a pack of standard guitar strings ] and a bass string as either a drone or a d-bow being that the string will run over the top neck. I wasn`t sure about the stress of 11 strings on a frame so after talking with Cajun a few times...Thx bro for the info!... i went with a stacked 1x2 frame. Inside the box the necks are screwed into front and rear blocking with added bracing on the bottom of the inside necks.