Sharepoint Site Script - Add document set to default library - configure Document view widget

Hello, 

I am new to site scripts and modern sharepoint. 

I have to create 30 +  sites all connected to one hub site.  Each site is exactly the same .

1. Same Document set ("Project Docs") added to the default "documents" library

2. Site home page - single column, showing only the "documents library"

3. Pruned Quicklaunch bar according to spec. 

I know I can do #3. But can I do #'s 1 and 2 with a site script?  How do I add the document web part to a single column view , I can't seem to figure that out from the reference. 

Thanks