The Brass Man sounds a little like the Colossus from jason and the Argonauts...
Oh, and the 2EMM's insect entry contains the giant tick, which isn't an insect at all. I just noticed that.
Yeah, 1E and 2E loved their giant creepy crawlies. As well as insects, you had the various arachnids (spiders, scorpions and even ticks), not to mention all the other arthropods, like giant crayfish, crabs, centipedes etc.

Giant crayfish were surprisingly common opponents in early modules. I always felt like my characters should carry around a giant keg of butter, just in case!