Hi, Here is the current schematic. There is a bit of leway in what triac and opto-triac coupler you can use. Each output is for 10A, so I would not put more than 2-4A on each output maybe 600W, plus remember to keep wire gage in mind!
The "AC_out" should be connected to the "hot" of the load and the neutral of the load connected to ac neutral.
If there is enough interest I might make a PCB and sell a kit with 4 outputs.