Installing kitchen cabinets into utility room. Using a 1000mm corner
unit. There is a base unit corner post to offset it from the connecting
units along the adjoining wall.

Looking at the corner post, the sensible sequence to line everything up
seems to be - fit doors to both units , then line up corner post
between the two doors and fix to base unit.

Is this right?

And if so - is it then possible to join the two cabinets together?
Units in a run are obviously easy - but in the corner (due to the
corner post) obviously there is a 3cm gap between them. As this is a
very small room with only a few units, would prefer to join them
together if possible (for stability).