Comment by ReleaseCandidat

The measurements in the default(?) plan look off:

        cabinet 200cm x 92cm top 3cm bottom 15cm scale 5
        50cm     *        *        20cm
    *   drawer   door     door     drawer
    *   drawer   ^        ^        drawer
    *   ^        ^        >        drawer
    *   >        drawer   drawer   <

The program suggests 4 x 18.6cm = 74.4cm, but the actual remaining height is 74cm (92 - 15 - 3). Changing the scale from 5 to 4 or 6 yields the correct value of 18.5cm