Without some more detail like a photo or a plan, it's a little hard to answer your question, but what if you put a 24" dishwasher next to the 24" sink and centered the whole thing under the 48" wide window?

Offset the sink -- that's kind of GENIUS!!! The room is incredibly odd, so this could really work well! I'll try to get a picture uploaded so you can see why. Thank you, thank you, thank you!