Decide if you will have a branch or pot for a planter on this piece. Secure those to the egg crate. Use horizontal pieces of egg crate zip tied to the vertical egg crate to create ledges for pots or dimension to the structure. Now it's time for the expanding foam. Put down a base layer of foam under the egg crate. Seriously one thin layer at a time DO NOT put more foam on top of a layer of foam until it is fully cured. If you do not, the foam will have no place to expand and break out the back of the cage. If the egg crate is not properly held down, weight it down to prevent the edges from pushing up from the foam.
