every engine in my schools engine lab is more or less sitting like that [but most have a rad and cooling fan on them, so the belts are somewhat shielded, and there is wire screens on the turbo inlets]
i guess if you are not use to it, it would be a little scary standing so close to one of those engines running especially of someone gives it full fuel so it hits the governed rpm.
in the lab at school, we had
N14 cummins
S60 ddc
E6 mack
isbe cummins
isx cummins
855 cummins
dt466 navistar
3126e cat
c13 cat [or c12??]
6v71 na ddc
6v92 turbo ddc
3406 cat
those are the ones i can think of that i remember the models. .
we also had a single cylinder lister hand cranked engine [it can be started without decompression valve too] some air cooled deutz v6 [11 liter range] some hino I6 idi engine [6 liter'ish] an old bedford 6 cylinder with 5 holes working, and a whole slew of other engines that were in pieces and not in running condition [that bedford ran with 5 holes out of the 6 assembles [#1 was sitting on the bench (piston, rod, pushtubes, injector)]
and all out engines when running you could get as close to as the one in the video clip [except for the 6v92 running under load on the dyno]
no clipboards for us, but lots of co2 extingushers avalable