I have a home built in 1900 with lath and plaster walls. I want to be able to both have nice walls and insulate. My idea is to knock off all the plaster to the lath, put up plastic on the wall 4 feet up, fill from the inside with the blown in cellulose, fill in all gaps, then to continue up the wall with plastic and insulation. Finally, put drywall over the lath. Is this a good idea? (my thinking is that the lath will keep strength in the wall and will keep it level and reduce the number of screws that pop out. What do you think?