converting a .net project to vaadin project or re-developing it?

hi all,

I am working on an intranet project which i can manage polls of customers, reportings, analyses, etc. for my company. The project is web based and is being developed as .net project.

After I discovered Vaadin I decided to re-code this project with vaadin. But I don’t know where i should begin.

You can see the screenshots at the attachments.
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You can start with the login view:

https://vaadin.com/wiki/-/wiki/Main/Creating%20a%20simple%20login%20view