I sent an email to the gentleman who made the tree and the sphere asking about the plastic sphere parts. Below is his reply.
Rick S
I bought the hemispheres from Edith Aiken Company:
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LoginI bought two of the 12.00" diameter white. Request a 1/2 inch flange around the edges
Also, it is important to have a 1/2 inch drill bit that is made for acrylic plastic or else you will probably chip or crack the acrylic plastic while drilling the holes.
I bought mine from ePastics at: You are not allowed to view links.
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LoginYou can also buy the drill bit from TAP plastics: You are not allowed to view links.
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Login -Brian Bruderer