my design is, (pimping myself here) very very efficient. Not only in the performance aspect, but also the manufacturing and cost-effectiveness areas.
you will notice that a lot of members are busy doing the same thing, you might want to go have a look at what's in
this thread.
if you are good with your hands, then this one will be a walk in the park...
I've seen some pretty nice temps.
the depth of the channels, all depend of the thickness of the block, and the location of the channel, I'm using VDFC extensively in my designs, the two halves do line up with the pins over one another yes.