I reckon the japanese classics don't really fit the lifestyle of the most hellaflush/stancenation guys. It's not like a modern car where there's lots of info on which brand of coilovers wind all the way down, and what specific offset and wheel width will get you a 2mm wheel gap.
You're on your own with a classic, and all the aftermarket parts you need are hard to get. And the first time you smash the sump of your super-lowered Hako (and the sump is the lowest point of the car in a Hako...) your car will be off the road while you spend 6mths sourcing a new one...
For example, look at that Mike Burroughs guy (the really lowered, formerly rusty and now chopped 1980s 5-series beemer). He chose the harder path with his car, in that everything on it needs to be home-made or fabricated. Notwithstanding the fame he's earned, it's not like you see any other 1980s euro classics with the same treatment.
Occasionally you'll get someone like the Fatlace guys who'll give a Hako or Kenmeri the treatment (and of course we have our own Yuta too). As Drive510 also said, I think it's a bit of a double standard to get a kick out of garuchan/kaido-racer/bosozoku cars and not these, too. I think it kinda amounts to the same thing, which is to make a car that's fun to look at.
To be honest, for every one hellaflush'd Skyline in the USA, there are 500 more in Japan, with candy pink paint, more bondo than metal, springs removed and 5 foot tall vertical tailpipes
No Kev, you are eating a duck fetus.