Blue 2lb sheet foam between the dimensional lumber.
1/2" plywood over floor and wall patches.
Funnily enough no styrofoam, like in the floors and walls, in the ceiling. Added 1 1/2" of it. 1/8" plywood was shot so in goes 1x12 white pine boards.
Welded up strap extensions to angle steel in the door opening in attempt to avoid sagging doors when the windows are added.
Three ceiling light locations roughed in.