That Case is for the Ethernet and USB Board which is provided by Innomaker.
You can get these pcb on Amazon
LINK:
"https://www.amazon.de/dp/B09WMRFV7F?ref=cm_sw_r_cso_em_apan_dp_FF16F5085TVDC30MXZES_1&ref_=cm_sw_r_cso_em_apan_dp_FF16F5085TVDC30MXZES_1&social_share=cm_sw_r_cso_em_apan_dp_FF16F5085TVDC30MXZES_1&starsLeft=1&skipTwisterOG=1 "

In this Version 1 i've already tested it but found that the pins are to fragile, and could be damaged during disassembly. The next Version will have a different type.
I've printed that in PLA on a ANYCUBIC I3 Mega, fits perfektly.

The Top cover is availabe in two Options.
Option 1 got the cut out for the Heatsink
Option 2 got the cut out like option 1 and holes for a switch and 2 LED's.

Option 2 is done, caused by family member having troubles in there home network. While i'm not at home or bussy with my own stuff, they could press the switch and the OpenVPN Client starts logging into my Firewall at home and give me the option to see what is going on as soon as i have time for that. A red LED is providing a general Status during login and a green one shows the actuall VPN Status. This is not done yet but i'm working on it.