Would you be prepared to give up the shower for a tub and shower? For the next five years it might be useful.You could remove the sink and shower and place the bath along that wall (with the shower fixture where it is)Hard to see space but could you fit a small sink in front of the window or next to where the shower was (again hard to tell your dimensions).....?

Here are some ideas. I hope you like them!

The builder ought to be ashamed for not cleaning up each night...that is part of what my contractors do...every night. As far as flooring...since the cabinets are on the darker side...use a contrasting flooring in travertine stone. use the largest pieces you can get...usually 18" are good but if you can get 24" that's even better! Put them on the diamond. as far as backsplash use travertine again and bring in the same color as the flooring. Use a touch of contrast in the pattern like a darker liner or a motif of somekind.

Can a polished concrete floor be laid in a kitchen without removing kitchen units?