I agree it is a tight squeeze from starboard locker, but that's how I do it. I have to take my wrist watch off first just to fit my arm in, and I take my wedding ring off for safe keeping. Consider turning the air intakes slightly to gain every fraction of an inch you can. As I remove the dipstick, I end up turning it like a baton on my hand to get it out.
I also have a small work light with a spring clip that l strategically position to provide light.
Regards,
Bill