The co-creator of the first ARM processor explains the layout of the chip.

The "datapath" uses 3/5th at the "bottom" and it looks a lot like what I have also concluded in this project. The ALU (left) is right next to the register file, in a regular, bitslice fashion. 32 slices are stacked vertically (bit0 at the bottom). A barrel shifter is placed at the right of the ALU. This is pretty similar to what I intend to do, so I reinvented the wheel again :-D