I can't read Japanese, but had a look at the signage. Actually - $540 US wouldn't be bad at all for a kit! If I understand what's on there.
Limited deluxe edition: 1,300,000yen: Built upon order/ taking orders from October 2018: finished model, using 3D printed parts, metal parts etc, distributed outside Japan from Sideshow.
Mass market edition: 150,000yen : to be released Autumn 2019: finished model, using ABS parts, distributed outside Japan from Sideshow.
Styrene kit edition: 60,000yen: to be released Summer 2019: assembly kit, distributed outside Japan from Moebius models.
The photos I posted above are of the prototype for the deluxe edition with 3D printed parts.
I suppose some degree of intricacy (like pipes floating above the surface, thinness of those pipes, voids within minute trusses, sharpness of panel molds running along curved surfaces) shall be sacrificed when this is converted to injection mold-able or cast-able parts.
Also, the 57 feet prop has unique details for each "vertebra", but the mass market edition and the styrene kit edition shall standardize those details to some degree, to lower the cost of making many mold dies.
Kaiyodo is not Bandai. The company doesn't own their own factory were they can perform cutting edge technical R&D, which enabled such kits like the PG Falcon. The number they can sell a 2001 kit cannot be comparable with Starwars items either. So even though the kit edition may cost a bit more than the PG Falcon, it would be difficult to imagine the two being in the same league in terms of technical quality.