I have 2 plastic compost bins that I would like to replace with wooden ones. Could anyone advise me as to the best ones to buy please? Some have gaps (which I presume would be best for ventilation) but lots of others don't. Many that I see advertised look as if you would have to dismantle the sides to get the compost out! I really don't want to go back to buying plastic so any advice would be very gratefully appreciated.