Abstract: A multi-piece tub/shower unit having a trackless shower door and a method of assembly and installation of the same wherein the multi-piece tub/shower unit is comprised of a first sidewall, having a sidewall nailing flange and a front flanged surface, and a shower door water retaining bead as an integral part of the front flanged surface and further comprising at least one point of assembly having a debossed aperture; a backwall, having a backwall nailing flange and at least one point of assembly having a debossed aperture, whereby the backwall and the first sidewall are interconnected at the point of assembly by a christmas tree clip, having a first ribbed shank, a second ribbed shank and a shank head, whereby the christmas tree clip is inserted flushly within the debossed aperture of the point of assembly; the multi-piece tub/shower unit is further comprised of a bathtub unit having a tub nailing flange and a tub top ledge wherein the tub top ledge is comprised of an apron ledge having a shower door water re