Identifying the product potentials

I got some old WD external boxes and found identifying exactly what they are a challenge. Here is what I think I have:
Part #WD2000HSU - two 3.5" bays, 1-usb 2.0 port (possibly the original MyBook Mirror)
Part #WDVBHxxxxxxx - two 3.5" bays, 1-1Gb RJ-45, 1-usb 2.0 port (possibly the MyBook Duo Live)
Part #I'll let you know - four 3.5" bays, 1-1Gb RJ-45, 2-usb 2.0 (rear), 1-usb 2.0 (front) WD Sharespace

Some ideas and observations. The Sharespace enclosure is quite nice and it occurred to me how it might house an Intel NUC or Raspberry Pi (replacing the unit mainboard). Has anyone considered using these boards on this unit with pin header cables? Now that we know how to open the MyBook boxes without destroying them, has anyone considered replacing the LAN or usb chip to increase its meager performance?

Now that my unrealistic notions have been exposed, let's get down to the practical:
I've said goodbye to Windows permanently and only run Linux distros. It would be helpful to get these up and running so can any of the boxes above be flashed to accept newer, lower power 5400rpm drives?

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