Update .... I am still cogitating on this project.
(Unfortunately, when as part of the planning I moved some videos on a shelf in the room and discovered a large extent of mould spores, so my attention has been diverted to ripping out bits of the existing fittings to investigate THAT problem!)
Thanks for the photo idoodle, yes, that would be the sort of thing. I thought I'd make two of them, very similar, purpose-built to fit my Youview, Sky, video/DVD and storage boxes, the other to sit alongside it as an ad-hoc coffee table. Everything will be on casters, of course.
I'm definitely going to use plywood. I don't like MDF at all and as I have some severe allergies to dust I have to be extremely careful about what I use. I had to drill twenty 1/2" holes into a piece of pine yesterday and that didn't affect me at all, but MDF dust .... hmmm.. Also, as a lady I am not as strong as most of you muscle-men on here, and once I started to join two or three bits of MDF together I fear it will quickly become too heavy for me to lift or manipulate.
A friend has offered to lend me a biscuit jointer. I have no idea if that is appropriate for plywood. Is it? If so, are biscuits better than dowels?
Also, I have to fit out two alcoves with hand-made shelving, and I think it would be better for me to do this first, as a sort of "training" run, because if anything goes wrong, it won't be seen; whereas if I mess up anything that's on the wall or floor, it's going to be very very in your face.
Lastly, a (different) friend wants to come and stay for 10 days over Xmas, and enjoys doing a bit of DIY. So I might prepare this project to be done at that time, that way I will have some help.
LHL