None. Usually a mattress is made of fabric and springs
Wood is much less conductive to heat than metals are.
Yes. I did it all through freshman year in college. Twin comforters are bigger than the mattress to begin with, and the few extra inches that an extra long twin mattress has won't make that much of a difference.
Yes. Just make sure the top of your platform bed frame is extremely firm and made of thick wood. If you do not have a completely solid top, you need to make it that way first.
The best type of wood to use for bed slats is typically hardwoods like oak, maple, or beech. These woods are strong and durable, providing good support for the mattress.
From what I have heard, using flavored wood chips does make a large difference not only in the taste of the food but its tenderness as well.
Cherry wood.
When your mattress grows too old to use, the upcoming purchase can be daunting, and sometimes you may try to prolong its inevitable discarding. Using mattress toppers or a protector is good to use to prolong your mattress life, but not when it's nearing its end. If your old mattress is already showing signs of aging and reducing your sleep quality, a mattress topper won't work a miracle. However, a mattress topper is an excellent mattress accessory upgrade when installed on a new mattress or a while after purchase. You may have the best mattress, but if it has lost its capabilities over time, there's not much you can do except discard it.
To make your bed mattress last longer you should consider getting a vinyl mattress cover and a padded mattress cover. These help from spills of fluids or any other stains which may reduce the quality of your mattress. Also flipping your mattress onto the other side every 6 months can help ensure longer life.
To make things with it
no
use wood
To make wood white in Photoshop, you can use the "Hue/Saturation" adjustment layer to desaturate the colors and make the wood appear white. You can also use the "Levels" adjustment layer to adjust the brightness and contrast of the wood to achieve a white color.