There are 4 of the DIY Goldrush's currently available, but the design isn't as clean looking as the assembled version, imo. Looks like where the
threads were pressed in is visable to the outside of the
mod, maybe not thick enough of material to conceal. The preassembled unit uses a bottom screw cap similar to a flashlight, whereas, I'd guess, to make it an easier DIY unit it has been split in half.
I too have been keeping my eyes open for a Blue Lightning, or a (Black Nightmare) if it ever comes about. But would prefer the look of a preassembled.