A castor supported dolly assembly comprising a plurality of dolly members formed of a lightweight, disposable and/or severable material may be interconnected into interchangeable operative positions to define supporting orientations. Each dolly member includes and at least one connecting segment comprising a slot and a base. A connected orientation, of any two of the dolly members, comprises a confronting relation of the bases of engaging connecting segments and an aligned orientation of corresponding passages formed therein, so as to concurrently and removably receive and retain a castor in interconnecting relation to the confronting bases. Each dolly member may also include at least one supporting segment structured to receive a castor therein.