To trade off circuit architectures, I'd need to get an idea about the relative size of 1.8V PMOS and NMOS (in pwell on deep nwell) transistors compared to 5V transistors. Do magic example layouts or pcells for high voltage transistors exist, and if so, where?

magic -d XR -rcfile /usr/local/share/pdk/sky130A/libs.tech/magic/sky130A.magicrc

seems to give me only standard 1.8V NMOS and PMOS parametrized device layouts, and I don't know where to find information how to turn them into 5V transistors.

@Christoph Maier the magic device generator (Devices 1) menu, has nmos and pmos available. From the pop up menu, you can choose the device type, including 5V devices.

THANKS! That helps. Looks like the 5 V devices aren't so much bigger than the 1.8 V devices to warrant playing with 1.8 V pmos and level shifters.