I like the shape of the skimmed down block set, very nice. having a rotary table helps there I'd find that very had to do on a straight x-y
All I can think of on that is it may be a little weak in the areas shown below until the lid is soldered on (I assume it's being soldered on?)
Artic silver is not conductive but it is capacitive, (see their site for more details). I'd be a little concerned having the copper touching the pcb directly without some type of isolator / insulator other than paste. Mica shims are perfect for this as they also have reasonable heat transfer properties. Any radio shack should have some in stock you can cut to size. You'd need to allow for its compressed thickness though.
Not a very good picture but this is an extreme close up of the mica shim in place under my gpu block retainer on the Asus 9800xt to give an idea.
I had to modify the retainer because there were extra components in this area on the Asus, compared to the previous 9800 pro card
