Yeah I have a Befaco Spring Reverb which I like, it's hooked up to a large tank which I have mounted underneath the table where a lot of my eurorack gear sits. But like the A-199 the RCA connectors are only in back, so I had to leave 2 HP open to run the cables in/out. So keep that in mind. But anyway, I would consider getting the Befaco instead of the A-199, it gives you CV control over both inputs as well as the mix in the same amount of space, and also uses less current from the +12V rail, which in your case is probably a good thing. And I can tell you from experience that the sliders on the Befaco are very "playable". I've had a few spring reverbs and it is the only one I've kept.
-- adaris
Cool, looks good. I'll save for one. The Doepfer is a little noisy so I'm running it through a low pass filter on my studio mixer for now. Not ideal but getting some nice sounds out of the subharmonicon