Thanks for the tips and encouraging words, everyone. π
Here's the "final" version. Changed since last posting: some colors & textures, tweaked tile color/position/bump map, softened shadow, ceiling fan, light switches, outlets, tone mapping.
I experimented with HDR on this - output 5 Gamma tonemap exposure steps (1.00, 2.00, ...), merged them in PS, then Shadow/Highlight adjusted. I liked this version better than the product of my previous process (HSV or Linear tonemapping, PS Shadow/Highlight adjustment). It produced a more realistic image; though highlights are more overexposed than with just Shadow/Highlight adjustment, it appeared more like a real photograph for that very reason.
KT MLT 62h - tonemap exposure series - HDR PS - PS PP