4 - 1x12 @ 8 feet long OR 1 sheet of 3/4" plywood or MDF ripped into 11 1/2" wide strips, 8 feet long
4 - 1x12 @ 75" (Bench Top/Bottom)
Please read through the entire plan and all comments before beginning this project. It is also advisable to review the Getting Started Section. Take all necessary precautions to build safely and smartly. Work on a clean level surface, free of imperfections or debris. Always use straight boards. Check for square after each step. Always predrill holes before attaching with screws. Use glue with finish nails for a stronger hold. Wipe excess glue off bare wood for stained projects, as dried glue will not take stain. Be safe, have fun, and ask for help if you need it. Good luck!
Now it's time to build the headboard. First we must make a decision. If you have a table saw, rip 1/4" off each side of your 2x4 boards so that the total width of your 2x4s are 3". Also, this will give you a nice square edge to your 2x4s. I ripped mine, and all dimensions given are for ripped 2x4s. If you do not have a tablesaw, it's really okay. You will just need to subtract an inch from the headboard/footboard panels and trim. This is noted in the diagram. Once you have decided on your leg widths, cut your particle board panel to the correct width, and the trim. Attach the trim with 1 1/4" finish nails and glue.
As we go to assemble the beds, we will need to do something about the gap in between. I wanted the mattress to be able to breathe, as children can have accidents. So I choose a slatted system. To begin, use 1 1/4" finish nails and glue (on the top edge of the cleat so you don't poke through) to attach cleats 3/4" down from the bench tops.
If you want to have some hidden storage (the cubbies on the ends are perfect for fabric bins, and also allow for a nightstand) it's easy to build doors. You should measure the opening, with your doors starting in the center of the bed and covering the outer dividers. I used 1x2s to build a frame, placed plywood on the back (make sure that the plywood is 3/4" short on the ends, so that the door can sit fully inset) with 3/4" finish nails and glue, and attached with hinges and clasps. After many trials and as many errors, the easiest method I found was to use hinges as shown above.
It is always recommended to apply a test coat on a hidden area or scrap piece to ensure color evenness and adhesion. Use primer or wood conditioner as needed.