Noice!
Although, I gotta say… Even though my Tyrs run
surprisingly cool, the way yours are so snug in there leaves me a bit uneasy. You might want to consider leaving an inch or two left and right of each amp to allow for more air flow over the heat sink ribs.
Also, don't stack them, that vent up top is pretty crucial, too.
I suppose you could be fine leaving them like that, but if your room gets warmer than 75 degrees, I wouldn't be completely shocked if they end up tripping into thermal protection mode on you every once in a while.
I still know next to nothing about tubes, but I
can say that you should try yourself a (matched) quad of Tung-Sol 6SN7 in your Freya. They can (or since they're Russian: "could once"?) be had for relatively cheap, and they are a
massive upgrade over the JJ in pretty much every regard.