My father-in-law, who is in the construction business, says because we'd have to replace the ceiling joists anyway, this should be no big deal (relatively). He says to add height we would just add a new section of studs with top and bottom plates above what currently exists and put the joists on top of that. I am envisioning the existing walls with top-plates intact, a new bottom plate above that with 2ft or so studs and a new top plate.
Does this sound reasonable? It doesn't sound structurally stable to me as the studs will not run the height of the wall. Any thoughts would be appreciated.
Thanks in advance.