What if the channel was vertical an placed at the center of the pyramid? /| |\ / | | \ / | | \ /===/ \ \ blocks surface at the center of the

What if the channel was vertical an placed at the center of the pyramid? /| |\ / | | \ / | | \ /===/ \ \ blocks surface at the center of the floor while it's being built. The entering tunnel is gently sloped but doesn't have to reach the top of the pyramid. I guess it would be easier to build since the the walls of the channels are kept in place by the weight of the whole structure. I don't know about the bladders though.