@MadDogMe: yeah, good idea but 25$ is only for blade, and additional $$$ for arbor and stuff is becames too much IMO. And making something on your own for using that blade is IMO dangerous (lots of sharp teeth, moving fast...Alien?

)...it's doable and good for long run, but the question is would it pay for itself...dunno
@g.l.amour: I accesed #Rotor's site today without problems.
As for base thickness, I just listened to #Rotors experience. And according to this graph, 6 mm base is quite good if you want heat to spread good. Or, am I wrong?
I did a little cutting on the block today with 1.5 mm mill bit on my drill press, moving slowly the block and cutting the channels between the holes. Now my hand hurts cos' I held it firmly. It's time consuming and there's a clear and present danger of breaking the bit, but I did it as an experiment. I'll post the pic (I hope so) tomorrow of one half of the block cutted this way...
Cheers