So this build is a one-off. A look at what it's possible to create when you don't care about availability or cost effectiveness. I have two of the Brickcraft Axle Connector w/5 Leaves pieces from
recent reviews. There's only one in each set so that basically makes them $4.97 each if you buy the set just to get them.
I chose to end it in the Smooth 2L Axle Connector so I didn't have to use a Large Jumper (of either the Square or Round variety) to secure it to the Plate. The Friction Axle/Pin between that and the 1x1 Round Brick is slightly exposed but I can live with that.
In terms of price the 2L Axles are $0.01 each, Triple Axle/Pin Connector is $0.03, Friction Axle/Pins are $0.01 each, the 2L Pin Connector w/Slot is $0.02, 1x1 Round Bricks are $0.01 each, the 1x1 Round Plate is $0.01, and the Smooth 2L Axle Connector is $0.01 for a total of $10.07 for the entire tree. I hope this gives people ideas or techniques to use in their terrain builds.