I want to cut up the heatpipe assembly, reuse the PWM block with bolts and a fan, and replace the NB and SB sinks....

Are the SB, NB, and PWM heatsink bases on the IP35 "solid" ? i.e. the heatpipes do not extend into the blocks?

What material is inside the heatpipes? Does it have mercury or some other major toxic stuff?