Well, back home, they made the walls and ceiling out of a steel/adamantium amalgam because of cost and strength issues, so sure, some of that would be nice, tougher stuff would be nicer for the plating, but the bots need to be easy and cost effective to replace or repair.
By the by, you and I haven't met yet. Remy Lebeau. Elder one, younger one's around here somewhere, getting himself in trouble no doubt.