Be careful with a transistor like this...  The model guys may not have characterized a structure like this and the models may not be accurate no matter how you lay it out.

I normally don't rely on anything but matching when I use devices like this.  I have only really used very long transistors in startup circuits, diode stacks, and hysteresis.

I've seen all kinds of layout for long transistors but I don't recall ever hearing of someone having an issue between silicon and simulation with the exception of the power maybe.

Hi,
Thank you AnalogDE and Dan Clement! That was helpful!