can you change the build struct radius?

i was wondering if a peasant could build farther away from itself, like if it could build a shipyard in the ocean while it was still far enough to be on land. like, maybe "build structure" could be edited like a spell?

also, less importantly, i was wondering if buildings could build structures... or if units could train units.

any help at all would be very much appreciated.. thx!

p.s. i dont need a way around it with triggers or using spells instead. i want it to be directly from a build icon.