Parametric Rack for small plastic bottles

Fully paremetric Rack for small Bottles
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This is my very first openscad project, so don't expect beautiful code ;-) I guess it could be optimized, because it takes some time to render, more than I would expect for such a simple shape.

I am a Vaper and I like to mix my own liquids, so there are a ton of small flavor bottles which need to be stored somewhere, preferably in an air-tight plastic box. So I designed this parametric bottle rack to keep every bottle at its place.

The rack is heavily customizable. You can change about anything but the number of bottles. The approach is to set the desired width and length of the rack and the diameter of a bottle (add a bit for tolerance) and then the maximum possible amount of bottle slots is computed and they are spread evenly across the plate.

Ground plate and upper plate are connected by pillars. You can choose the amount of them (2,4,6,8) and the offset to avoid the placement i