I've always loved this case, it looks really great, though one thing that I'm not so keen on is those bayres's and also the fact that the internals of the case is bare aluminium..
Powder coating/spray painting internals all the way for me, it makes internals look soooooo much better!
Also, I'd use compression fittings over barbs anyday, they're far more secure than barbs, a lot of people will say that using 7/16" tubing over 1/2" barbs is the best, but on several occasions I've had my 7/16" tubing pop off the 1/2" fittings when I've been leak testing.
Barbs are crap imo, compressions look 1000 times better...
Some people go on about how compressions will "unscrew" themselves because of twists in the tubing, well I've had my system WC'ed for over a year now and I have yet to see any of my compressions unscrew themselves.
Though, each to their own, if you prefer barbs that's your choice, I personally would use 3/8" ID 5/8" OD tubing over 1/2" barbs, you'll need to dip the ends of the tubing into warm water first, then fit it over the 1/2" barbs, that way you won't need to use any cable ties/jubilee clips to keep the tubing onto the fittings which imo gives it a better look when using barbs..