If you have a salvage yard near you, you could also check with them for used doors and find a perfect match for not much money at all. And the bonus is, you don't have to install the sides or the headers. Just hang the door and enjoy.
Go to Craigs list and search free items. The bunk beds can be easily remedied by taking the goo gone and getting the stickers off and a small pint of stain to match the finish on there. Looks like pine. You can use paper towels and just wipe it on sparingly. You will love the results. A...
Have the same problem. We used a car jack to stabilize the window along with putting screws in the side to stabilize the window while we worked on the wood beneath it. Have got it framed with hardiplank, and hubby is currently bricking in the base so that we don't EVER have this problem again...