Ahhh the bottom (said the bishop to the actress, but I digress). There is no padding on the bottom and better still, the aluminium handles support the bottom of the case off the floor allowing air to circulate.
I won't really be doing a lot of modding I suppose, but I can stick some pictures up when I get to fitting the radiator.
Regarding the number of radiators, the answer is depends on what you're cooling. I'm aiming for silence (hence the choice of case) and so will be w/c the CPU and GFX. To do this I understand I'll need a big quality radiator so got a 120.3 Thermochill which should be ample for my needs. You could use a 120.2 and a 120.1 or whatever but this case has room for the biggest rad so why not.