@Timewalker - we look forward to seeing you on the T420 thread soon...
Notes: (sorry about off-topic here)
BIOS: There is a modded bios for your new box to remove white-list and enable other adv features - BUT STAY ON v1.46 !!! though.
USB3 - and there seems to be a report of using Rehabman's GenericXCHI kext for USB3 on el capitan for this Renaisas chop . as you know i have T420 (not T420s) - but others will be interested in your findings.