Just realized that my Invoice App needs a big design change.
And just after finishing the feature where you can toggle Rate/Hours or Qty/Price sets for each item.
If the invoice is simple (has no credit or installments), there is a ton of empty real-estate by the totals sidebar.
So next is to make the Totals modular so it can ride alongside the items, or credit / installments depending on if they're created.
I hope I don't think of any more features, lol.