Modular under-cupboard spice rack

Note there is now a version 2 of this rack, available here. We had a cupboard full of jars of spices and herbs, and it was impossible to find anything unless it was on the front row. You couldn't see the tops of the jars as they were stacked two layers deep. I couldn't find what I wanted to organise these jars elsewhere, so I designed this rack. Note we shop at Tesco in the UK and the rack takes Tesco jars which are 100mm high and about 43mm square (not really square, but 43mm is the maximum dimension). This spice rack utilises the dead space under your wall cupboards. It makes it easy to find the jar you need, and it frees up valuable cupboard space for other things. It is a modular design, with each module holding nine jars. Each module comes in two parts, first there is a mounting plate you screw to the bottom of your cupboard, and then the rack itself which slides in to the plate. I used four 15mm x 3.5mm countersunk screws to attach each plate, but probably roundhead screw