Here are some more updates...
I have since attached my custom pots with drainage tubes left extra long...I then foamed in around the pots and the branches
I still wanted some more plants on my background so i went to the dollar store and bought some cheap curlers...they have ample drainage through them and their various sizes allow you to put them in places that normal pots would not fit...i am still in the process of adding them...
Here are some pictures of some of the Schleffera's that I went out and bought...they are just temporarily placed in there right now so i could get a better picture of how they would look...