It appears that companies are selling cases that are designed for the 15" powerbook for the 14" iBook. This makes sense. However, I am sure that you are going to have a little bit of additional space left in the case.
As for painting the ibook, you will have to paint the outside as I have learned the new ones don't have the ability to remove the cover and paint the inside. Check the mod guides for some techniques on how to paint your ibook.
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PBparts.com usually has a decent selection of case plastics, however they aren't cheap. Your best bet is to keep watching eBay for a 700MHZ G3 ibook or lower if you want to strip the paint and make your own design. Get one with a dead screen then part out the other electronics. After that and into the G4 line Apple moved away from the painted lexan. To some degree you might be able to use different model case plastics, but it will probably require extra work. Tho' I vaguly recall someone using newer parts in older plastics.
With the ibook case plastics...be careful that the case you buy has the same kind of optical drive as your ibook. Not sure if ibook slot-loader plastics are compatible with the tray-loading models and vice versa.
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