But I am extremely DIY-challenged and DH is even worse (the man doesn't know how to open his own car bonnet) so even if you tell me how easy it is to make something like that for myself, I would stare blankly at you a bit like this while my brain played soothing musak....
Not really something we've considered before as usually trees around where we would hang something, and inside the tent we just hang one of those LCD thingies (cheapy) on the pole. When no trees, we've just plonked lamp on table. Can't remember if it worked, but then, I'm like some freak just staring into the fire anyway, so I'm not a reliable source of table-usefulness!
I can't really judge from the picture, but check whether there is enough space to hang your existing lamp. Except for that, it's not exactly the world's most expensive thing (ignoring the other £1,345 already spent on camping goods), so maybe a nice-to-have? Upside: Will take no space whatsoever.
Noooooo! Can you imagine stumbling out the tent in the night for a wee and cracking your head on that? At a camp I went to recently, someone in our circle of tents fitted us all out with metal shepherds hook type thing outside the tents, one on each side of each tent doorway. Then jamjars with tealights in, bit of string to hang them - lovely!