tree testing material

for the actuall basis of my thrre i have decided to uve papier mache and mache over my tree base which woul dbe made up of card bord tubes and and metal wire for the branches the metal tube is ok when mached over but the card bord tube lloks quit child like and i have thought that maybe plaster would best suit this like maybe mod roc even thought this would be alot messyer i think the end result would be alot more better and professional