Plenty on YouTube about building billet box rba’s, just search for the rba and you’ll find someone, watch the genuine ones too, sxk stuff is just a copy of them, so pretty much the same....
Wicking is the key to a rba working properly, too little cotton and you’ll be leaking, too much and you’ll be getting dry hits, thickness of juice also play apart here, it’s abit trail and error....
Also when installing the coil, worth checking for shorts on your mod/ohms reader with the chimney in place, as coil too high can contact the chimney and cause them, make sure your coil legs are clipped absolutely flush too, this is something that can cause shorts with the chimney is in place...