d3.js multi swimlane gantt chart

I am trying to recreate something I have created in Excel VBA and d3.js looks like it ‘could’ work great for me. I found some examples on here and adapted. I have created this (thanks to the help of the original creator). d3.js Gantt Timeline_v2 - JSFiddle - Code Playground

I am trying to re-create my vba swimlane application in d3. Here is an image. its fully automated, but limited. e.g. have to redraw what wanting a different time period. ( which the d3 brush could solve).

If anyone can help - maybe a tutorial of sorts, that would be fantastic.

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