So I've gone and done it..

I tore off the interior today (which had real Phillips screws holding it on) and bought some R5 from Lowes and R1 foil for the vapor barrier..

Then I did the R5 Green stuff from Lowes.. its 1" thick.. between the studs..

I cut a 24" roll of bubble foil roughly to 8" strips.. and put in..

This is the corner where the bathroom will be.. so that way I can start on that this week..

You can see the toilet flange in the pic that square under it is the 19x15 Dometic 310 toilet.

The right square drawn on the floor cardboard.. is the 24x32 tub..

I will have 32+" from door to the bathroom wall..  :)