Documentation for customizing iNotes

Is there anything available for iNotes 8.5.1 similar to the ‘DWA 7 Customization’ Red Book ? I am happy to buy something if necessary. At present it’s a struggle to discover if we can make the changes we need and where to make them. For example, does the Widgets link have to appear below all the mail views, folders, etc? - we’d like it to be above, or maybe an option on the action bar. We are moving from Notes 6.5 to 8.5, so it’s all very different…

Any information appreciated. Thanks.