Good idea, and good list!
I may of missed it, but throw in some type of swaybar disconnects for both, and RCV axles for 35's.
Regarding the skids: I would say NOT needed for 33's, and Yes to 35's.
Plates and Skids are important, especially sliders when in a decent sized rock garden, or in the "rocks." But the frequency or likelihood of a 33 in the rocks vs a 35 in the rocks is lower. (In rocks where skids are needed)
Also, consider noting intangible concepts such as: wear and tear between 33 & 35 and COG.