I love this! It's exactly what I've been looking for and checks some boxes for things I've needed for a long time in a modeling (vs diagramming only) tool. I discovered C4 a few months back, so finding that it has C4 support is awesome.

Would you be willing to elaborate a bit on what frameworks, tools, and technologies are used to create IcePanel? Anything you're willing to share, and specifically I'm curious if you used React Flow.