I've seen GC a/c installation & spoken to two private installers. MBR & bedroom 2 will not be an issue on how they lay the trunking. As for bedroom 3, everyone proposed a different routing method. Goodness, I've yet to decide which is the optimum. GC routed the trunking for bedroom 3 through the kitchen & service yard. Wow, but I won't do conceal of a/c trunking leh. Urgghhhh