I have a cinder block basement with columns on the side walls. The guys I hired don’t want to frame around the columns on the side wall. They want to frame a straight line and leave the column part without a sill plate with only the sheetrock covering the column. My concern is that the sheetrock will be almost in touch with the column or I’ll lose a lot of space if I do a straight wall 4.5 inches offset the column.

Is it OK for the sheetrock to almost touch the column with no insulation behind. The picture shows a PT lumber approximately where they plan to drive in the sill plate. Pls ignore the red chalk line.