Picture Book Marathon Book #6 is:
"WEX-5: Giant Robot Dwarf"
This is the companion book to "Alpha Centaur." See, the inter-dimensional exchange that brought Chester into the land of Science Fiction, also put a giant space construction robot into a Fantasy world. Chester and WEX-5 are essentially exchange students, swapping cultures and locations.
Since WEX-5 is a digging robot, he is co-opted by some dwarves, and spends all his time digging holes for them. His story is substantially less interesting than Chester's. Still, there are 38 sequels, to match the "Alpha Centaur" series.
Phew, this is my first post in the marathon where I'm posting on a day I usually don't. Friday night is weekend territory. I'm starting to feel the burn.