It's a possibility it might be changed at a later date, we were looking at that but couldn't find a mk1 inlet at the time. My dad's designed a quick release system at the back of the inlet so it can be removed easily and without having to remove the head
A question you or someone may raise from that, is "you don't need to remove the head to get the inlet off, so why do that?"
This engine has a tubular manifold, and it uses an allen bolt in the middle, between exhaust valve 2 and 3 - you just can't get on it easily enough. So he's designed something to get around this problem.