Here's the front panel measurements for the SC-1mk3viewtopic.php?f=1&t=46
>> Also, would a four-in-one introduce more possibility of interference/other random electrical issues over having two separate rack units?
There are no interference problems. My mk2 fits (4) in a case.
But the mk3 has a wider PCB and so only 2 channels can fit in a case.
>would one PT cover the power needs of the unit?
Yes. The preamp is very "Green" in power consumption... You can power 8 channels with a small 30VA power transformer.