You sure this is a drawing of the Mercedes MB O405G Volgren
(ex-SBS 999U)? It looks more like the Volvo B10M-A to me - the
Mercedes had much wider windows than this.
Think they used the same template of the B10M to draw the
O405G.
Btw, SBS999U is O405GN? The pic posted
earlier by tamago says GN...which i remember is low floor and
according to what i remember about 999U, it isnt.