Regarding the headboard height and frame slats issues:
http://www.infobarrel.com/What_to_Consider_When_Buying_a_Headboard_or_Footboard_for_your_Bed_or_Frame
Headboards can be mounted on the wall, on to the bed frame or can be completely free standing. Mounting the headboard on the wall is the easiest method as you do not have deal with the bed frame mounting screws. But if you cannot or do not want to drill into your walls, you will need make sure that the bed frame has sets of holes at the head of the bed. These holes will allow large screws to fasten a headboard to the bed. If neither of these options are suitable for your needs, consider getting a free standing headboard. These headboards are large and heavy enough to stand on their own as a piece of furniture and can be wedged between the bed and wall for extra stability. Many designers also add a bed bench at the foot of the bed if there is no good mounting choices.
http://www.jamisonbedding.com/mattress-faqs
Why is my new mattress set much higher than my old one?
While this is expected, it can certainly be surprising; however, there are several simple remedies. The first rule is, “Change the height, not the mattress.” Your sales associate can help you reduce the height of your mattress set with the following options.
* Reduced height box spring — a matching box spring of equal quality at a lower height.
* Low profile bed frame — a strong metal bed frame of equal quality at a lower height.
* Drop-down metal rails — a lower height rail system that accommodates a headboard and footboard.
How do I set up my Queen or King mattress and box spring?
Make sure you place your mattress set in an appropriate bed frame with a rigid center support that includes at least five legs. If your bed frame includes a headboard and footboard, make sure the support consists of five hardwood cross slats or three metal cross slats with a rigid center support on each cross slat.
If you have a King mattress set, you may notice the formation of body signatures. As most individuals do not sleep in the middle of the bed and tend to sleep in the same spot night after night, body signatures may form. Therefore, you may notice a ridge in the middle of the mattress, which is quite normal.
