More progress last night. Despite starting quite late I managed to get the two coal space sides in place.
I had anticipated that one of them may not fit very well and might leave a gap that would in fairness be hidden by the coal but I was pleasantly surprised when after a little tweaking with pliers and a rub of some abrasive paper it went into place as it should. Just the details and coal rails to add now.
I am not sure why but I chose to use shiny sinks to clean it up after I finished instead of my usual Bar Keepers Friend and it turned all the solder black making it look to be worse than it is.