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Hhmmm, you are going to have to open the box and "squeeze around inside" to mount your DRAM anyway, so you might as well use an internal SSD (a M.2 NVMe SSD will kick the pants of any other internal or external solution).
You will certainly be able to mount multiple drives via TBT3, but I haven't used any non-Intel, Windows-based, Software RAID solutions so I cannot comment on their applicability; what I can say is that Intel's RST RAID capability is not applicable for TBT3-mounted drives.
As for SATA drives, some of the NUC7 boxes (the "H" models) will have an internal bay for a 2.5" SATA HDD/SSD/SSHD. If you use a (albeit slower) M.2 SATA SSD in the internal M.2 socket, it is possible to use Intel RST RAID across this drive and an internal 2.5" SATA SSD/SSHD/HDD. This includes a RAID1 configuration where the 2.5" SATA SSD/SSHD/HDD is a mirror of the M.2 SATA SSD.
Having a pair (or any number really) of SATA drives in an external enclosure is certainly possible; USB3 or TBT3 will be your mechanisms for connecting them.
Hope this helps,