yes, yes, yes, you can.
that is exactly what the majority of the Sugo 01 users do, myself included. the NT06 heatsink sits directly under the PSU fan, and the fan drags air through the heatsink and outside via the PSU.
people did this fine with systems using FX62 chips, and cases loaded down with graphics cards and harddrives, and i have never heard of a problem.
it will work just as well with the Sugo 03, provided you have a good PSU, but this applied to the 01 as well.
[edit] i too would love to see a completely bare aluminium panmel with no ventilation, as i would only ever use this case with the NT06 heatsink and a reversed PSU. [/edit]