developing Custom Visual with Table Data Binding

Hey MPO,

my answer for the first question:

There are not so many Examples, from the scratch. The API GitHub Page has one.

Some Blogs get Examples too: 

https://sharepointforum.org/threads/build-your-custom-visuals-in-power-bi-step-by-step.61069/

And in the End maybe some Older Custom Visuals from this site:

https://app.powerbi.com/visuals/

Do you need WinRar or something similiar.

All this possibilites are not satisfying, the best way is try and error.

That direct me to the second question:

Here you can see, i do not use the columns. Power BI select my three categorys to one and set the two measure values behind them. I need some experiance too and iam not sure that will works for you. But you can try it out and maybe that will help.

"table":{
                "rows": {
                    "select": [
                        {
                            "for": { "in": "Date"}
                        },
                        {
                            "for": { "in": "ProjectColor"}
                        },
                        {
                            "for": { "in": "ProjectID"}
                        },
                        {
                            "for": { "in": "X"}
                        },
                        {
                            "for": { "in": "Size"}
                        }
                    ]
                }
            }

When i get a better solution i will post it under your stackoverflow post.

To your last question: 

I think without the browser, debugging is very hard. My workaround is the Chrome Javascript Console to debug my Visual.

That would work with the package too.