On Monday, February 12, 2018 at 8:00:58 AM UTC-6, AMuzi wrote:

Assuming you have a compatible BB, 170mm LH arm, 110mm
chainring and bolt set already, yes you can cut away the
inner ring seats:
http://www.yellowjersey.org/crankcut.html

We used to do that back in the years when compact doubles
were not offered.

--
Andrew Muzi

As I am sure you are well aware, a long time ago, the inner ring had separate spacers to get the inner ring out in air. Now days the rage is to mold in the spacers in metal directly into the crank arms. No separate spacers.