a boat tower conversion kit for converting from a half tower to a full tower without the need for complete removal and / or destruction of the original half tower . a custom hard top incorporates a central core platform with several integral reinforcing plates . the plates provide structural support for the later expansion of the half tower by adding the upper tower section and upper platform . leg members and ladder members of the upper and lower tower sections automatically mate with one - another in coaxial alignment , and are structurally secured to one - another through the interfacing integral reinforcing plates . integral channels , wiring conduits and tubes provide for electrical wiring , electrical and mechanical components in conjunction with the custom platform core .