No I have not seen that particular project until now. It is very similar to a lot I have seen, his will be vertical where mine will be horizontal. The vertical build takes up much less space but of course I have to be different, the passive radiators will not work on the horizontal plane only the vertical plane so mine have to lay on their sides in "cradles" . My subs will be 40" long in 18"tubes with 700g of mass added to the passive radiators I get a final enclosure tuning of 21.75Hz, and have to use a high pass filter at 18Hz so the driver will not exceed its excursion.