Very cool and inventive. The only problem I see you might have is your rockwool staying too wet. The water roots will hang down in the res and where the rockwool is now is the air root ball. It can get wet but need good dryout time too. I might would stick the water line down in the rocks. It will keep the rockwool moist on bottom.

The living wall you need to do a grow thread on. Awsome. Only thing there is the rocks and roots will clog up your system. You might need a small cup just on top the pipe. Roots hang in pipe nutes flow down hill roots not enough to clog pipe. NFT.

Get your lights closer and if you can spend the money lights are the best investment.

Keep the pic's coming