[hexagonal]

Machine time for something this big is very expensive: that's why it's used for making molds, which is a fabrication technology that scales up very easily; unlike CNC machining, which doesn't scale at all.

Additionally, surface finish with ±0.2mm X/Y is going to be pretty poor. It won't produce finished parts, you'll need to sand/grind it, or coat it with fiberglass and sand that. It also doesn't mention deflection under load, or feedrate through anything tougher than foam plastic.

[ZenPsycho]

which part of any of that prevents it from being used for architectural purposes?

[ktizo]

If you can use it for boats and blades, you can use it for prefab panel moulds.