I've got schematics in my journal but nothing online. i did drain to waste last year in Promix/coco and hated handwatering with a 60hr/ week job. i have another emergency overflow drain that runs directly into the existing Basement sump to be pumped out to my backyard.
After that, Basically...
You may end up with pythium in the veg room over the cold nights. I did the same thing last winter and ended up recirculating CO2 and mites throughout my house :(
I used a DIY ezcloner to start mine and had to veg a couple extra weeks due to some root damage I initiated during xplant. Very good system I think, had to separate the root systems (which got huge whilst on vacation) just keep an eye on them and xplant sooner than later :)
I'm running a recirculating hempy now as well. 2 weeks into flower and I'm at 1.7-1.8 EC with Chem-Gro nutes. I've been using HydroGardens for fruits and vegetables for 15 years so the mixing and whatnot is the same. Very happy with hempy. 1/2 perlite, 1/2 hydroton clay balls in the bucket...