The backlash is greatly reduced in the deluxe kit as well as it having ground screws which are more accurate over length. If you are thinking about doing any of the upgrades to the basic kit might as well save for the deluxe kit. I still think I will be fine with what I have just running at slower rates, especially the z. The gas strut made a huge difference I am able to raise and lower the head using my fingers on the z axis ballscrew gear.
As an update I have all the wires cut and am starting to assemble them. I plan on running all the cables from the tables to the electrics box in the back then using amphenol mil connectored cables to an external box housing the cnc electrics. I tested the TB6560 3 axis motor controller for the limit switches and the and estop I determined that the board has internal pullup resistors which will make the wiring a little easier to deal with. I also did something a little unusual in wiring the stepper motors. I cut the external wires short and using plastic braided wrap over the 2 pair shielded cable I connected the stepper for bipolar parallel operation. I used dual wall heat shrink (has hot glue inside) and shrank the braid to the cable covering up the connections (pictures to come). Since I am connecting bipolar series for the time being I removed the end cap from the stepper and rewired it to run in series. I did this so I can have the cable sealed from day one. To switch to parallel I will have to quickly remove the internal jumpers and reconnect to the 8 external wires. The z axis motor will be untouched as it is internal to the electrics box and I will just change the wiring on the connector to the cnc box.