Kitchen window sill advice

[Brett28]

Hi im going to have a go at tiling my kitchen, just wondering if it is possible to tile this window sill instead of having the plastic sill on? It is plasterboard with wood packing it up as the window was actually below the bench but im not sure if tile would stick to the wood/plasterboard edge well its only 30mm? any advice on if this can be done even if involves altering it is appreciated, see attached pics thanks