I don’t know how much flour you’d need but you should definitely increase the other ingredients by the same proportion as the flour. If you have a recipe you like for an M inch pizza and you want an N inch pizza you should be able to scale all the ingredients up proportionately by calculating the area of an M inch circle and an N inch circle. But bear in mind that rolling out a ginormous pizza and moving it around is difficult (I’d definitely use a pan rather than trying to get an 18” or larger pizza to slide off of a peel onto a stone). And make sure your oven is big enough.
Oh, and I do like flipping through cookbooks for ideas. When I see something I like in a cookbook, I use my phone to scan it into One Note.
It can be a little awkward flipping between recipes when I’m making multiple things from recipes at the same time. My setup is good enough but not great
I’ve been using One Note. I had the same issues you had with paper and recipe cards and I happened to be using MS office a lot in general. It’s handy since I can use it from my phone or laptop and can share with family. I copy internet recipes to One Note since they can be available offline and since sometimes recipes on random sites disappear.
Converting to something I can self host would be cool.
I don’t think I’d ever use meal planning and shopping list features. It would be nice to have an easy way to generate nutrition info for my invented or modified recipes.