Down pipe.
On a relatively modern frame.
So, if it's built properly, to work well, the divergent cone and belly will be under the frame.
Unless they are limiting the travel - by means that make the units bottom earlier, it will have less chance of survival than a sun burnt snowflake.
Modern , long travel bikes leave about an inch / 2inches at the most between the frame rails and flat ground.
I like what they are doing, but, unless they are limiting the travel, or it's a flat track bike, it sure isn't remotely practical with a down pipe. So, building for a style they like = impractical bike.
Gives them precisely what they, I would assume, would not want from a bike. Impracticality