Possibly some people will have a problem with the suggestion of prototyping a BI solution. Agile methods are increasingly what's expected of BI projects. Agile emphasises iterative delivery rather than RAD and "prototype" is an offensive word to many agile practitioners 😉 Just a thought, although I haven't tried your tool.
You may be aware that there are other metadata driven BI in-a-box type solutions. Examples:
RED and BIML are developer tools whereas Kalido is also a production data integration engine. Personally I prefer the development tool approach.