Copper here, copper there

The heatsink is fairly well made, generally above that of your typical copper heatsinks, but there are a few behind the sceens tricks to make it look like this. The most obvious example is the small ridge which keeps in the copper fin sections.

The machined base gets a bit of a brushing or polishing to spruce it up too.

The copper fins on the Goliath are dip brazed in place. Dip Brazing is a way to solder complex assemblies by submersion in high temperature salt baths. The salt acts like a flux and the solder migrates to the joints by capillary action. Since the entire unit is heated consistently, there is very little if any deformation and tolerances can be held quite close.