Went with the longer Y axis (364 mm) and also used an alternate Y endstop holder from https://www.thingiverse.com/thing:2374305. For materials, I printed in Matter Hackers Translucent Aqua PETG and Atomic Filaments Translucent Aqua PETG. A few parts were printed in Hatchbox Black PLA. I tended to print at 100% infill because I had a long time to get ready for the project.
Last point - I did get the printer working, but I'm definitely going to add 4 shims to go under the Y-axis bearings to give me more clearance. The shims I'm going to use are at https://www.thingiverse.com/thing:1698328.
Great design and documentation @pheeney!!