Looks really interesting! I was evaluating grid/table projects a while ago for use on project where I wanted high performance with big data sets with custom row rendering and it's obviously a nontrivial problem. There's tons of libraries out there, each with their own quirks and endless issues being posted on their bug trackers.

I ended up using https://www.ag-grid.com/ which started charging for features and appears to making good money. Have you considered going this route?