4. Are there any known issues with your "air gapped" system being the same physical hardware as your everyday system even if you use a LiveCD?
The airgap networks I've seen have run in separate rooms from the regular network and use a different kind of networking hardware in order to make cross-contamination impossible. For instance, if the network uses gigabit Ethernet then the airgap will use 10base2 coaxial cable, or some other incompatible networking system. (This may be the only remaining legitimate use for 10base2...)
If your airgap system is network-compatible with the regular system, then you don't have an airgap. What you have instead is something that looks like an airgap until somebody has a five-second braino while hooking up network cables, and you don't discover for two weeks afterwards that your airgap was breached.
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