This should cover the mechanical, electrical, functional, performance, side, etc. of AXIOM Beta plugin modules. Some information is already scattered over the wiki and website, some information should be acquired through developer interviews.
https://wiki.apertus.org/index.php/Beta_HDMI_Plugin_Module
https://wiki.apertus.org/index.php/AXIOM_Beta/Manual#Plugin_Modules_and_Shields