Personally when I contemplated using an external design, I would just drill holes for the bulkhead quick connects (1 for in and 1 for out). For the box containing the w/c stuff, just drill two holes a little bit larger than the tubing OD. I would use some rubber around the hole to make sure that no jagged or sharp edges could puncture the hose. Then I would use some black drainage pipes (the crinkled kind) to put around the 2 tubes in between the two boxes to protect and insulate them.
That's what I was gonna do. I hope that helps.
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