the only kingspan i found today was an 8x4 @50pound so i didnt bother will pick up some off cut on the next job im on .and have a play so to day i progressed mullet cam shaped my 4x4 to a mullet shape and made a wing then a lump of lead to ballest it .still playing need some sea trials .2 foot of softwood needs more than 3.5lbs of lead to sink it !