I've been looking online and I think that this can be done by using a half height frame and a normal concealed cistern. The units will be backing onto a stud wall rather than a solid wall. Will that be OK? If so, which frames and cistern do you recommend. I've seen a Roper Rhodes one which is compatable with a Vortex cistern. I need a cistern with a small push button with flexible connection which can fit on the drawer element of the unit so I think my choice is limited! I hope that all makes sense!