20 while the notch 32 has a depth which is essentially the same as the thickness of the bottom panel 22 as a result of this dimensional relationship when the panels 20 22 are inserted into the notches 30 32 the top panel 20 lies flush with an adjacent upper edge 42 of each tubular member 24 while the bottom panel 22 lies flush with an adjacent lower edge 44 of each tubular member 24 this dimensional relationship also allows the top panel 20 to rest on the upper ledge 36 in abutment with the upper shoulder 34 of each tubular member 24 while the bottom panel 22 rests on the lower ledge 40 in abutment with the lower shoulder 38 of each tubular member 24 the tubular member s 24 can be made from any suitable material such as extruded aluminum the panels 20 22 can be made from any suitable material such as rigid fiberglass any conventional means can be employed to attach the panels 20 22 to the tubular member s 24 even though it is assembled from several individual parts the hardtop 10 has the appearance of a one piece i e seamless structure see fig2 a and 2c moreover the assembled hardtop 10 has clean i e u201c trim u201d edges which further enhance its aesthetic appearance see fig2 a and 2c depending upon the size of the hardtop 10 it may be necessary to provide the frame 18 with an intermediate structure 46 in order to maintain the desired spacing between the top panel 20 and the bottom panel 22.