Psst. The seller took my offer for $75 each on these (NOTE: they do not come with AC adapters, so factor that into your price. Or if you have some old Toshiba chargers laying around, they're the exact specs as the 19V a NUC comes with.)
And if you just so happen to offer them $20 each for these, they might just take that offer too. ;D
Regarding the adapter power requirements, It looks to be the same exact power req for the one you used. Shouldn't be any different to power than yours. I just am trying to figure out the cleanest way to do this with power delivery. There is a 2x2 mini molex on the NUC board, but unfortunately it's for power input, not output. The NUC5I5MYBE is a really neat little board for homelabers and just DIYers in general.
EDIT: Page 58 shows 540 MB/s (that's MegaBytes, so theoretically 4320 Mb/s) so that's not going to be enough for 10 Gbe, but it would work for 4x 1Gbe which is what I'm planning to do.
EDIT: The more I look, the more I realize I am better off using a M.2 E Key to NVMe adapter and the adapter you used in your original plan. Gives me faster SSD speeds, and a full 2x bandwidth for the NICs to use.
https://www.amazon.com/Sintech-NGFF-NVME-WiFi-Cable/dp/B07DZF1W55
Must use a nVME SSD, NOT a AHCI SSD.
Must have full firmware from MrChromebox
Must remove WiFi/bluetooth and use USB instead.