Depending on size, I'd be tempted to buy a kitchen base unit and put your own top/ doors on it. But if thats not suitable a google of simple cupboard plans (then look at 'images' ) gets plenty of results, for example...
I do not have any dowelling jigs or a pocket hole jig so it looks I might have to purchase a carcass, not purchasing anymore tools these days, wondering how to dispose of the ones I've got.