That's where I went wrong then, I was reading the instructions. There was nothing in there about drilling holes and I was just merrily punching half etched holes through as rivets. It wasn't a problem and soon sorted.
The location holes are shown on the assembly drawing. You just have to drill them out for the reasons mentioned above. I thought about mentioning them in the assembly text but decided instead to mention them on the assembly drawing. You stated that there were no locations given for the holes for the handrails. This is just not true and you should have the good grace to accept that you made an innacurate statement.
I think it is important that these online builds do not develop into some self-ego feed for the builder [who is of course always right] and set against the manufacturer [who we all know is always in the wrong]