guardoff

My main needs are really simple: just to draw the things I make, mainly in wood. So, mainly rectangles and straight lines, hairline thickness, no fill. But I do need precise dimensions. By historical accident, I have always done this work in Freehand, so there is a lot about the Affinity environment that is familiar to me. But what Affinity does not apparently have is the precious facility to place guides and then move the rulers' zero point to any point of intersection on those guides (to draw some extra element to a certain exact size, check particular dimensions within the drawing, etc). Does Affinity offer me some alternative way to do what I want to do here? I have the Affinity Work Book, so any answer that refers me to this text would suit me just fine. Thanks Mark