Fitted unit for basin and concealed cistern in downstairs loo

[Epictantrum]

Hi all,
I'm struggling to decide what to do with our downstairs loo which is desperately in need of ripping out and replacing (the tiles and loo etc are at least 30 years old I reckon).
The loo and sink sit next to each other along the back wall, and I was thinking of a piece of furniture to house a concealed cistern and sit a semi-recessed basin on. I haven't found any shop bought furniture that I like or that would fit perfectly in the space. So I was thinking of asking a joiner to build a simple cupboard, but I'm worrying about the cistern access. Anyone else done this and have any advice?
thanks

I'm about to do it. Howdens have a nice range of built in bathroom furniture - they do a nice painted shaker style range.

But I don't like semi recessed basins, so I am getting a narrow undermount sink, and my joiner is going to cut down the depth of standard kitchen base units so they are 400mm deep. You can just use an end panel in front of the concealed system with a flush panel fitted on it.

What dimensions are you looking at?

We've done similar. Just don't touch Bath Store with a bargepole, it looks awful and we only did it 2 years ago. It already needs replacing and clearly isn't actually waterproof............. and their customer service is appalling.

You can get a joiner to build a cabinet and then just leave a loose piece of worktop on top of it so you can get at the cistern.

Thanks both. It 140cm wide, height and depth are negotiable! Thanks for the tip, I'll avoid bath store and take a look at howdens; painted shaker is exactly what I'm after. Good tip about the kitchen units. My ideal is a Devol style cabinet with a brass cupboard catch. I'd love a tiled "worktop" but might not look great if it has to be loose. Don't you need front access to the cistern as well?

Front access through the flush plate is sufficient, if you have that you don't need top access.