a with opposite flats 34 b to receive a wrench 43 which is used to rotate the pressure foot and move it axially and apply the upward vertical face against the ceiling the wrench is used similarly with the bottom pressure feet engaging the floor track after pressure feet adjustment is complete the upper position of panel 14 where the pressure feet are visible is covered by front crown molding 18 c and rear crown molding 18 d each being snapped on via horizontal bead projection 45 and mating horizontal groove 46 in crown molding 18 c as seen in fig4 a similar and essentially the same operation and construction is employed at the bottom of the wall with groove 46 of base molding releasably coupled with projection 45 which extends laterally from floor track 41 fig1 shows door frame 16 with header panel 17 immediately above the door frame fig1 shows channel components 10 a of door frame 16 and inner frame 17 a of header panel 17 fig5 shows the top part 17 t of header panel 17 with front and rear faces 17 a and 17 b junction biscuit 26 for coupling header panel 17 to adjacent basic panel 15 not shown here ceiling track 40 extends above header panel 17 and front and rear crown moldings 18 c and.