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The result looks nice. I think this type of diagramming need to be as straightforward as possible, with as little typing as possible. I see you use many different types. For example

gcp.Database.Sql(diagram.NodeLabel("Database"))

What does the NodeLabel type provide that you would not gain with just the string?

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It's an implementation of the functional option pattern used a lot in go code. See https://dave.cheney.net/2014/10/17/functional-options-for-fr... for a rundown.

It's a functor, though the type system doesn't let you write a reusable fmap.

Looks like NodeLabel is a function which allows you to instantiate a NodeOptions with only the label attribute set in a shorthand way. So the functions taking the results of NodeLabel calls are able to accept more complicated options, the examples just don’t show this.

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