Tree's are a great addition as long as you can remove and/or rotate them. To keep costs down I built mine using galvanized electrical/mechanical tubing (not conduit) easy to weld, light weight and plenty strong enough. Created the base's using 1/4" plate 4X4 and mounting the plate to the boat and securing the tree's using pins to allow rotation and removal. The challenging part was to create the center dowel pin the correct dia. to put the tree on. Total investment $50.00, I did call in two favors for cutting and welding. I hope this helps...Yankee Crew