Wall corner cabinet includes a solid left & right back, bottom, top, left & right ends (gables) and shelf(s). The shaped bottom & top shelf and any other shaped shelves have there exposed edges finished in a “T-mould” or melamine edge. The bottom of the ends (gables) are pre-edged and if the back is a planted back, then the bottom of the backs are also pre-edged. 
See the “General Construction” page on this web site for further construction details