Problems trying to build plugin for 3.5.beta3

[stuartofmt]

I'm trying to create a dev environment to test / modify a plugin for 3.5.beta3.
I'm using windows and have downloaded the source and extracted it into a new folder.
I tried npm install but it compalained that package.json was missing (which it was). I separately downloaded that from the beta github and npm install ran.

Trying to run npm run build-plugin <plugin>

Other files and folders are missing e.g. build-plugin /src/plugins and ....

Short of trial and error (and maybe introducing errors) -- is there a correct way ?

Thanks in advance.

[stuartofmt]

@stuartofmt

Maybe I can answer my own question. Looks like I need to clone / fork the entire repository and not just the source.zip file