For the Nano convertor plate (to use an Arduino Nano and separate motor controllers) the STL in the build docs for V7.0.0-alpha2 has the Nano in the wrong place.
See: OFM summer build - #4 by WilliamW
This is corrected in the main repository, but not on the Alpha-2 build. The simplest way around it is to use the convertor plate STL from V7.0.0-alpha1, in /models from https://build.openflexure.org/openflexure-microscope/openflexure-microscope-v7.0.0-alpha1.zip