Hi Houzzers! My cabinets were installed yesterday and I love them!! But I want to add one set of a base cabinet and upper cabinet at the end where there is an odd space leftover before the end of the drop ceiling (see photo). No issue with time or delays to add these, but I need help figuring out what size to get...

- The space I'd like to fill is a little over 18" until the end of the drop ceiling

- The Base Cabinets the new base cabinet would connect to are 15" wide.

- The Wall Cabinets the new wall cabinet would connect to are 18" wide.

What I had originally priced out to add was a 15" Base Cabinet with a 3" end panel filler and an 18" Wall Cabinet. My cabinet guy is saying I should do an 18" Base Cabinet, but I'm worried it will look weird against the 15" ones... Am I being too anal? Will it even be noticeable? Am I just going insane from this remodel and need to relax??

Also, is there something I'm missing that could potentially cause the additional cabinets to extend PAST the drop ceiling? Eg, end panel width, space between existing cabinet and new? I want to make sure I'm asking the right questions...

THANK YOU!!!