Just got the Peak up and running.  It was a quick setup so I just have the Tung-Sol in it now but it sounds great... clarity is right. Cannot wait to get my HD800's back this weekend. 
 
Right now I have the amp on a footstool next to my setup.  With my planned setup,  I will only have about 1" clearance between the 6SN7 tube and the next shelf.  I assume that will be ok, the tube doesn't get too hot and there is a lot of room around it?  Of course, it is not optimal for tube rolling. 
 
Edit:  Guess I should have posted in the other Apex thread.