Switching your capital every 6 years, especially building a new one seems like a really dumb idea. Not to mention waste of resources and manpower. Must be real fun being a bureucraut or a courtier in this kingdom, every 6 years you drop everything and move to a new location, which isn't propably even fully developed and restart there. I suppose it would attract only dedicated servants.
Also this location doesn't seem that good. Middle of nowhere, no rivers or lakes, just mountains around it, no existing infrastructure. You mean to airlift all the materials there? Oh and it is bloody CURSED!
Mayhap this policy would make sense if each new capital was in a strategic location as a way of rushing new towns and cities, but even then that doesn't mean they'd prosper once you remove their main reason for existing, being the seat of power.
There are historical cases of this, for example with Ethiopia, but with each case, they eventually realized it's a damn stupid and expensive idea.