Caravan repair/restore, Melbourne.Seeking a recomendation please.

Hi everyone, have been off site lately. I'm seeking advice and a recomendation, I have a 1977 16ft Millard that has had leaks in all four corners inside, Timber inside walls are soft and cracked some slight some most of the way down the wall. At the moment each corner as far as I can tell is dry. The van has been outside for 8 weeks now after spending 8 months in a closed machinery shed. I would like to have the damage evaluated to see if it's worth doing up. I don't know if it's a timber frame or an aluminium frame. Can anyone recomend a business or a private caravan repair place ? I'm located in Sunbury. Thankyou.