Guido built his Double Cross from a mix of old and new parts and it is beautiful. He went with a 1x8 drivetrain with a 36t front x 11-32 in the back with a downtube shifter. A simple versatile set up that is working well for him.
Even though 1x drivetrains did not hit mainstream until we nailed down good shifting 10 and 11 speed cassettes, some folks are more fine with fewer cogs in the back. IRD recently release 12-40 9-speed and 13-40t 8-speed cassettes for those want to maintain some simplicity. (Guido is a cartoonist by trade.)