Somthing to at least consider is a product like Rustoleum Rust Reformer. You spray it on the rusted surface and it reacts with the rust to form something else. It will end the rust problem on that surface. You can paint over it. It is not for a non-rusted surface. I have spray-on but they might now have brush on. It is black. There are other similar products. I did use one (can't remember name) that was silver. it was brush on and was super expensive. If the surface is too rough you might smooth it a bit but don't remove the rust. For non-rusted areas use somthing else. I had a 20' boat trailer totally rusted. 5 spray cans covered it in a few minutes for maybe $30. I washed the trailer first. Compare that to the cost and time of sand blasting plus driving to/from the blaster etc. Painted the trailer next day. 2008. Still no rust. Good stuff :-)

If the window is a a single pane glass, a heat gun will be your best option.

If you are "stuck with the bookcase headboard" as you say, then I would not go streamlined with the bottom of the bed. It just won't look right IMHO. Keep the dust 'ruffle' and use a plain flat, box pleated one to avoid fussiness. It sounds like you just hate the dust ruffle and adequate storage in the room also seems to be a problem too, if there is no room for a nightstand and the only bookshelf is in the headboard..........maybe consider a captains bed for your son. It will look sturdy and streamlined and won't be fussy. It will provide more storage. Check CL. If you absolutely want no dust ruffle, and the captains bed is not right for you, try hiding the wheels with coffee cans. You can paint them to match the color of the frame. Use a quilt that is long enough to cover the frame even though it will match the cans. Personally I would not spend a dime, or waste the time, to try to make a silk purse out of a sow's ear. Those metal bed frames on wheels are ugly and noisy. Get a new bed that fits your needs and decorating desires. If your are on a strict budget consider the following options......... If you do not need wheels on the bed to move it around for cleaning why not just build a platform bed. You can just get four sturdy pillars or use glass block or just about anything and put a sturdy board over it. Make sure you also provide center supports. Since bookshelves are needed can you just put some on the wall. Get lumber and cut to size and make or buy brackets. Consider checking CraigsList for a new bed. Goodwill in my area has wonderfull items and always has beds, usually the full size ones and twin size. Freecycle may offer a bed frame that you can get just for hauling it away. If you live in a city keep your eyes peeled for great curbside finds. I've seen perfectly good bed frames and headboards set out curbside all the time. I've curbside shopped myself, and often I grab things that I can't use, but hate to see go to a landfill, and I bring them in to Goodwill. You wouldn't believe the nice things that people toss out.

I always reccomend to replace these windows with a vinyl replacement window, not to mention 95% of the customers want the same because they don't want to spend money to fix old rusted frames or restore old deteriorated wood frames and after spending all this money to fix, they still have an old window which will required maintanance. Replacement windows come in any size with insulated glass with screen, can be a hopper, sliding or double hung depending on the size of the unit, etc.