Deck Calculator Help

I'm putting together a new deck calculator. (online)

It works out stumps, bearers, joists and boards, spacings, lineal, cubic etc. and generates a plan image to show how it fits

Still testing, and would appreciate suggestions and some testing from people who actually build decks, before I hook it up to the site menu.

What needs to be added or removed?
Does the adjusted centres make sense?
Does the stump set in make sense?
Does the bearer set in / joist overhang make sense?
What are some common sizes (stump, bearer, joist, board) to start off with?

It lives here Deck Calculator

Thanks for any help and suggestions

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