Cleared for landing...
With the HS/F mounted you can see it just clears the Northbridge heatsink and doesn't overlap by more than a couple of millimetres, so you can still attach the fan as seen below.
With the motherboard installed you can now see that the top of the heatsink comes right up to the PSU mounting area which sits right over the heatsink. The plan is to use the heatsink/fan to force air into the power supply which also uses its giant cooling fan to suck in surrounding hot air and expel it out the back.
Inserting a DVD writer, here is the first of the issues with this setup. There's very little clearance with the HS/F and the connectors are in a recess that is not accessible to fat hands!
Not dwelling on the negatives for too long, we look now at the hard drive positioning with the unique foot mounting system Silverstone have employed.