Designing Kitchens and Bathrooms - Bathroom cabinet layout

Have a wall with a total length of 90 3/4 inches. Existing cabinets start from the left side after a 20 1/2 inch gap. Their demensions are 33 with sink, 18 with 3 drawers and finally another 18 with 3 drawers.
The thought was to move the first 18 to the open space, slide the 33 over or fill the gap with 2 1/2 inch spacer. After the 33, frame the new 18 opening and add a door. The last 18 would remain where it is.
The question is, does it make sense to try to put another sink over the re-framed 18? Would a sink to fit the space be too small? Would the two sinks be too close together?
Thanks

I may be missing something in your question, but I don't see room for two sinks. More info on the overall size of the room, etc.

The maximum counter top length is 90 3/4 inches. Currently a sink exists over the 33 inch cabinet. The hope, if possible, was to place another sink to the right of the existing one. That location would be over a newly framed 18 inch cabinet that is next to the 33.