if you can use sill plate gasket for your bottom plate. could you not use it to put behind your wooden studs against concrete wall. strap the wall using 2x3 and rigid board insulation. any gap fill with foam. tape all seams. drywall top half and want to wainscott bottom half. rite now have an issue with a wall that has been addressed in another post. but once it's been fixed like to go ahead with plan. room isn't that large thats why not really wanting to go other way. by attaching board first then put up frame. any major issues with going the gasket way.