For some of your answers, check out www.soundbrew.com and click on "Tech Info" on left column.
Your conversion is correct: about 1,300 bbl/year production. It is probably possible to do-it-yourself the planning, but if you have the resources ($$$), do yourself a favor and hire a consultant. There a few guys and companies in Germany who might be able to help, including the system manufacturers themselves.
A 20-HL system is probably most advised but remember that your pilsner market is lager yeast-based, meaning your batches will need more time and fermenting space. OTOH, you might consider a larger system due to having "only" 3 beers.


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