Generally Speaking ....
When you buy a S+ board you get the board with two empty slots - Game Chip and Reel Chip.
The game chip is like the OS for the machine and the Reel Chip is the theme. There are usually a number of reel chips with varying %% for each theme.
By changing out the reel chip, glass and strips you can change your S+ into practically any theme you want.
You can check out the IGT S+ bible (NLG home page, bottom Right under Ricks FAQs) and see the wide variety of options.
You mentioned missing CMOS - if the board came missing any other chips than the aforementioned (two) then I would deem it as defective.
A tray (with the transformer) is usually not included either.
Looks like you have already connected with BrokenTicker and he will make sure you get up and running.