Is it practical? For just a maybe situation some day in the future, not in my opinion.
Especially since the tail dragged gear sockets protrude slightly outside of the cowl profile. Who would want a tri gear with tail dragged gear sockets sticking out the aft bottom corners of the cowl?
As far as I am aware, there has never been an official part number for this mount. It was done on a custom order basis.
The only purpose it was originally intended for was people building airplanes to put on floats, that intended to fly as a tri gear during times that the floats were removed (the tail dragged gear sockets are used as float attach points).
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Van's Aircraft Engineering Prototype Shop Manager
RV-6A (aka "Junkyard Special ")