Yes we started our project using Godot, plus we did and we are still coding many additional parts in GDscript of course and C++ too, as usual.
About plugins, we've primarily focused on performance and avoiding bottlenecks, then we will also release more examples and docs on how to develop plugins, on our website.
PS: it's a gaming social marketplace!
(Plugins in K-Engine basically work like game mods), we decided to adopt this solution because it perfectly matches the game architecture when exported.
and... hopefully, more resources are coming! :)