Removing/refitting plastic doors and windows isn't a trivial task but totally DIYable with care and lots of youtube in advance! A paint scraper is usually all that's needed. Packing out the units is a bit of an art though, my efforts have varied in success levels but improving every time.
The only real risk to the sealed units is chipping a corner while lugging the things about. Other than that they're pretty strong. If you were to wreck one then they're pretty cheap to replace anyway.
The only real risk to the sealed units is chipping a corner while lugging the things about. Other than that they're pretty strong. If you were to wreck one then they're pretty cheap to replace anyway.