This is how we did the arms.
For the arms of the tree I made a wire frame using chicken wire and duck tape,
then got a couple of cans of expanding foam from HD and well foamed up the arms. (make sure you wear gloves).
Also I put a L shape PCV pipe in the middle of the arms
This year we are added a 10 foot talking pumpkin on the top of the roof with lighted pumpkins as the back ground.
                  
First we weld two 10' x 5' frames and added suports and wire fencing on the front.
Here is a picture of the mouth.
It is 8' x 4' also metal with wire
with rope light attatch.
Here we are seting up the eyes. We bolted the two frams together and used two arms for support
Here I'm going threw the mess of wires it took to make it work
Opps we forgot to plug in the top of the pumpkin.
Thanks Nate for the help.
Also this show you how tall it is
Here it is at night
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