A kingsize mattress is 40cm (16 inches) wider than a queensize mattress, so probably not.
They don't. If you use box spring foundations, you need to use the right size.
It would depend if you would like your mattress to be higher off the bed or not. Box springs can be anywhere from 6-10 inches thick. Most people use bunkie boards (which are usually 1-2 inches thick) as well when using temperpedic or other memory foam mattresses to make it easier to get on the bed.
It depends on the condition of the box spring and the design. For example, if there are metal support bars on your box spring, you will feel them through your memory foam topper.
That is okay to do as it will cover the whole bed.
They are, simply put, people in the organisation who influence the buying decision. It can also be the top management when the cost involved is high and benefits long term. Influencers provide information for strategically evaluating alternatives.
No.
Not especially as with twin beds the sides that are pressed together will simply press into the mattress and cause an uneven night's sleep. Best to just get a cheap king size bed frame - better yet to get a good frame to support the box springs and mattress.
A king boxspring is usually two twin sized. You could use a king size frame and put two twin beds on there, however that's going to leave a gap in the middle. You could use the two twin box springs and a king frame and then get a king mattress.
In the UK a Queen size mattress is 4ft6inches, so you really should use a divan box base that measures the same. If you use a 5ft King Size you may affect the stability of the mattress on top of the divan base or frame.
You can use a standard box frame mattress to be honest simply because the feather bed is added to the top of the mattress.
a new one.
You can put a mattress on the floor and it will be ok to sleep on. Box springs are a unit that allows you to use the matress on a bed. The springs sit on the edges of the bed frame and keep the mattress from falling on the floor. If your bed frame has slats that go across from one side to the other, you can just use a mattress. It won't be as comfortable.
Yes, a full size mattress will fit on a queen size bed frame. It may be just a tad bit smaller than the frame, but not too noticeable. I have a full mattress and use full/queen sheets and bedding all the time.
Yes it is a great mattress for daily use.
Maybe. European mattress sizes are different from US sizes, in a way that's not trivial to explain. In terms of length, most European mattresses are longer than the US standard sizes (while being slightly shorter than US "XL" sizes), but the width can be either more or less depending on the specific mattress size you're talking about Many bed frames are designed in such a way that it's possible to use a somewhat smaller mattress as long as you don't mind a bit of extra space around the edges. Also, a lot of frames make an allowance for thick bedclothes, and you may be able to get away with a (slightly) larger mattress than it was technically intended for. However, it's probably not going to be possible to use a US "King" mattress in a German "King" frame, since the US version is about 5 inches wider than its German counterpart. You'll need to get the actual dimensions for the frame/mattress and compare.
When drilling holes in a waterbed frame for a Sleep Number mattress, ensure you do so at the head and foot of the frame to accommodate the air chambers. Typically, you should drill holes that align with the mattress's air chamber ports, usually located on the sides. Use a drill bit that matches the size of the ports to ensure a snug fit, and avoid drilling too close to the edges to maintain the frame's integrity. Always check the manufacturer's guidelines for specific instructions regarding your mattress model.
King size mattresses are quite a bit larger than full size. If you use full size bedding on a king size mattress, you will find that you may be able to fit the flat pieces with no overhang at the edges of the mattress, as long as nothing is fitted to the mattress shape. But it wouldn't considered good practice in interior design.