I have a feeling I know the answer to this question as the quality/thickness of the desk looks excellent - but where did you buy your desk? Or, perhaps, more realistically, - where did you buy the cabinets for the ash(?) worktop. And if it is a worktop did they do it in 900mm as ideally i would want 750/800mm.
Looks great for hand built, as you even have a backboard(?)