These are extensible to exterior walls and due to Product Service System design, we can extend the requirement to include both cases.

Requirement

Main challenge resolved - integration into spaces where the modules do not have an exact fit. Solution requirement:

Make it fit initially to the most lax tolerance
Utilize a wrapper - an interface piece that can be adjusted in size readily. Follows Extreme Manufacturing principles.
Need a wrapper for sides, flat ceiling, inclined ceiling, and adjacent modules

flat surface for meeting with other wall or brick sections
flat surface for stacking for thickness. Base width is that of a 2x6. Therefore doubled up, it is 2x12 exuivalent.

Usable as exterior walls - upon doubling and extending with plywood.
Usable with any size window of 42"x90" or smaller frame
Usable as a wall unit (exterior or interior), bookshelf, window, or door unit
3/8" plywood face, painted on outside
Detachable with exposed fasteners that can be accessed for deconstruction
Caulked at right angle seams if necessary
Fully insulated air tight when joining adjacent panels
Allow for slanted sections under roof
Uses R19 fiberglass batts - ex [1]
Uses 2"x6" lumber, integrating with 2"x6" being used for all other structural components.
Layers 2 framed sections to achieve any width necessary, such as 15" for exterior wall.
Fittable with brick interior
Standard panel size of 4'x8', though 4'x7" in the present case due to lower ceiling height
Integrate with outer wood walls in that outer walls involve doubling + spacing of inner wall panels
Applicable in nature to inner and outer walls.
Integrated via flat face to window and door panels.
One side is finished and painted upon install. Insulation inside, and second side is open. Closing panel is pre-painted.
Straightness is enforced via plywood edge
Extensible in thickness via spacing and larger plywood
Stackable in height
Extensiblle in lenght via layering
Allow for ready addition of modules without having to redo surface finish - by having a flat edge surface, and creating a flat face.

MicroHouse Interior Walls