My understanding is that they’re releasing components of S4S for Mac gradually. For example, It was first released with tools for CAS recolours and now we can recolour objects. If you’re patient I’m sure we will see the addition of custom objects as well as walls and floors, etc.
I share you’re excitement as a Mac user! It’s awesome to finally be able to create/recolour cc!
If you are having problems seeing the CAPTCHA, please clear your browser's cache and cookies and ensure that you do not have any browser addons or extensions that interfere with the display of the CAPTCHA. Then, close the CAPTCHA window and click on the register button to open the CAPTCHA again.