Step 3: Can I make it so my placeholder image comes up as the default one?
Use 'My Computer' and drill down as follows: C: > Program Files > Globalscape > CuteSITE Builder > Images > Build Your Own > BuildYourOwn.gif
Rename the existing image BuildYourOwn.gif to something else, like OLDBuildYourOwn.gif. And then, copy your customized placeholder image to this same directory, and rename it as 'BuildYourOwn.gif'
And here's the result: