Far be it from me to offer you any advice but I would say to anyone that I wish that I had completed the smokebox/boiler/firebox assemblies and joined them before committing the firebox to the footplate. It is a very long beast and the smallest of errors in firebox location are amplified by the time you get to the front end. As it happens I was lucky and the miss was minimal: if I don't tell anyone nobody will notice the minor twist that resulted. I still kick myself as I should have realised there was a potential for this to happen. The other minor issue is that the steampipe castings are too short. I couldn't get them to line up properly and only when I compared them with the drawing did I realise what was amiss. A washer at the footplate interface resolved that though. You'll enjoy the kit though.