If you are an expert DIY person, have a large garage. Have access to a new sidepanel, [ not just the aluminium outer surface panel ] have access to the super glue to hold the panel on, have access to about 4 people to hold the panel on while you secure the side. have supports to hold the panel on while the glue sets, have tools to check there is no leaks after the repairs, then yes you can do a replacement of the damaged panel.
Or, take it to a caravan repair man, at a cost of £6000
BrianBW
July 2010