I will get our representative in HK to contact you as this might get quite involved in the setup for 1.
2.3.4. should be fairly easy when we come out with a compact system.
Spare balcony surface – can control any MixRack on the network by choosing IP address on bootup. no manual patching required for control only. If you need audio there then you will have to patch the audio bridge (Port-A) link. If you want to distribute audio between the systems then EtherSound in each MixRAck Port-B is probably the way to go.

A&H TechnoSpud