Thinking through the issues involved in advance of first fit, I realise that the issues of shadow gaps (or not) is one that I need to think through.    I did this search on site Are shadow gaps just a style thing? Or a feeling thing? Or used when needs must? Or just cheaper and so a way of saving money?  @LadyBuilder would disagree arguing that they are are all the rage, @ProDave uses them with care, I note, @Stones dislikes them but uses them when it suits.  @Trw144 uses the