profile part 14 is obtained in fabricating the body module in the same manner as the support profile parts 10 also the window and door frame members 34 and 36 are integrated into the sandwich structure 2 as shown in fig6 a and 6b at the corners of the window and door cutouts sighting radii are already formed at the frame members 34 36 and excess cover layer material is removed by hemming or finishing to exact measure along the window and door frame edges after the bonding together of the sandwich structure 2 the window panes 38 are subsequently fastened to the frame 34 together with a rubber seal 40 and an edging 42 the door frame profile 36 contains an integrally formed portion 44 forming the door stop fig6 b alternatively the door frame profile 36 may be designed as divided into two parts along the dashed dividing line in fig6 b and the profile portion 44 fastened to the door frame section 36 after completion of the sidewall module 2 3 according to a variant of fabrication of the body modules prior hardening of the cover layers 4 6 is dispensed with and instead they are placed on the shaping tool 16 18 together with the.