"Is it not possible to share the sockets a little more equally between the two sides so there is a little room for screw mounts on both sides ?"
I agree on this. It would give it much versatility. It's a pitty about the cold shoe not fitting there.
Overall anyway, it looks great and with many possibilities to build around it.
Thank you guys for the hard work!

Hello,
First let me apologize for joining this conversation this late. For starters, my opinion is that working with 3 HDMIs shouldn't be an option. Cables are not solid for long distances, connections even golden ones are not secure, and transferring that amount of data would be a real headache. I've worked as DATA manager and DIT in several production in Spain and Mexico, and SDI is the most reliable cable you can get at the moment. I know it requires implement soft and hard, but in my opinion, 3 HDMIs sounds scary.