Bumblebee nest box plans

I've succumbed and made a page of very simple plans for nest boxes using flowerpots and other stuff. It is so sad that people spend a fortune on commercial nest boxes, that often have unsuitable or no nesting materials, then site them in the wrong place and get so disappointed. Even if they do everything right their chances of success are only 25% at best. And this is why I've tried to keep away from this subject. There is no house hunter more picky than a nest searching queen. Her des. res. is dingy tunnel leading to an abandoned mouse/vole nest complete with nesting materials as well as poo and smell of urine. Not a beautifully crafted pine box stinking of glue and pine resin stuck on the end of a pole.