Retarder/Proofer

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Hello all. 

Over the last 9 months or so I’ve been “dialing in” my process and my recipe for traditional baguettes, and I’m getting pretty consistent results.  But now I want to control more of the variables and start tweaking the nuances.  To that end I want to construct a small retarder/proofer.  I’m handy and have some experience with marine refrigeration.  I’ve also been researching components - evaporators, heaters, controllers, fans.  But before diving in I’m wondering if anyone has some practical experience doing the same thing and might help me avoid any “oops”. 

Thanks!