It should be emphasised that this is not an easy build.  You even have to nail on the back panels - and yes - it is a very narrow rebate of about 4mm. ( A punch is essential. )    The dowels provided are weak. 
Having said that - with a (lot) more time than the 1 hour suggested, and liberal use of a liquid sprayed furniture wax to bring out the character,  I'd say that it looks and functions rather well.  Good value for money.   (Hot Tip : use the very best screw driver you have available.)