Hello Yahav,
Thanks for the update

Your version actually looks very neat, and great to hear that it worked well for your production!
We have now progressed further with our own
SpiExtender enclosure design. The intention is to make the
STL file available on request, so users can print the enclosure themselves.
Our design uses the
two existing mounting holes of the SpiExtender, which allows us to keep the enclosure quite compact.
We are currently working on the final version and expect to have the STL available
towards the end of next week.
Once it is ready, we can send you our version as well so you can compare it with your current design.
For the meantime, if your current enclosure is working well, it looks like a perfectly good solution for your installation.
Hope this helps!