the tutorial is several years old it is more of an outline than anything.
the md5s are on each download page... (get to them from the "overview" page)
auto md5 checks roll out with the new site (coming soon).
M1 is considered obsolete. (yeah you guessed it already)
re: The time utilized it in extracting all the drivers then Cab compressing them.
If you turned QSC = ON then the Cabs are Cached.
You won't then have to wait 9 hours for a Second (or third) slipstream
they would simply be copied from the Quick Stream Cache on successive runs.
The M1 process with the current set of main packs requires
370MB (Packs) + 2.2GB (extracted) + 1G (QSC) [for one set of 10 packs] + 1Gig (destination) =
puts you in the vicinity of 5 gig so I thought I should make sure
we had at least that much.
That is about 10% of your reported free space 
the better approack to this issue is to use the SAD feature of DriverPacks.
By running the DP_Inst_Tool.cmd file from a M2 slipstreamed disk
a local machines Drivers will be automaticaly updated.
and it uses less than 400 MB on lyour disc
instead of over 1 Gig.
DP_Inst_Tool also works with an M1 source
An M2 slipstream takes about 1 minute on your machine (9 min with an aqgressive AV program)
An M1 slipstream takes about the same amount of time on your machine - AFTER the first run -- if QSC is on.
KTD is rarely useful, if at all. If you are adding new hardware just run SAD at that time, using the most recent drivers 
let us know how your doing - thanks for reporting