I agree with adding a new tab then adding sections. Could be called Resources or something like that. For the bulb section, it would be nice to have an area for a picture of the playfield, so then numbers could be overlayed that reference a bulb chart similar to whats in the manual. That way you know exactly where each bulb type goes. Same thing for rubbers. The problem with just listing out rubber sizes/bulbs is that you may not know where they go without cross referencing something else otherwise.
I like the ability to add more things like cards or other docs.