Step 4: Adding the work platform
Now to add the work platform. If you're looking to do a lot of compost mixing, then a single sheet might be handy, but this works nicely. Because you're using the width of the bed as is, the slants (you know, the bits that support the mattress) should be the right width. The only thing is to a) cut out a corner notch if needs and b) add a central support under them - this hasn't got one and its pretty sturdy, certainly for modest use.