I created the tree by soldering the brass tubes together and to the PCB. 

My first round of solder looked lots better, and I didn't have drips on the PCB. However, I managed to solder 4 or 5 passageways closed, so I couldn't run the wires through. I unsoldered, cleaned, and resoldered the branches on a few more times until I could pull the wires through without shredding the insulation.

If the wire insulation gets nicked it will likely cause the copper to transfer to it, and with my growth times, every nick will be a full short after the electroforming.

Once I got the wires in I started connecting LEDs.

The plan is to connect to the negative leads from the LEDs to the wires, and insulate the exposed wires, and let the positive side to be the outer copper shell coating everything. I did it this way to leverage the diode quality to make sure the wires were not electrified during the plating and forming process.