Draw a straight line across the bottom of the shape to leave room to add five 18 gauge 5mm ID jump rings for the tree trunk. Mark the wire tree shape as well to help with placement in Step 22.
Lay out small scrap cut pieces close together above the straight line. Add another layer of scrap pieces. Try to make the second layer pieces touch at least three pieces on the first layer. Make sure there is enough scrap added outside where the wire shape will be placed so that an 18 gauge 3mm ID jump ring can be added for hanging.
Pro Tip: Because of the rough surface, a magnesia soldering block can slightly hold the first layer pieces in when place when add the second layer pieces. Heating the first layer, spritzing with flux, and heating until white before adding the second layer can also help.