hi angie and welcome to the boards!
honestly (as honestly as i can be since i'm partial to flying clouds) you should keep the flying cloud and have someone restore it for you (it won't be cheap but less than buying a new unit)
the fact that this trailer has been in your family since it was new. this is reason enough to keep your trailer
you also have a little jewel that sounds like it is in good shape. the 13 panel pre-57 flying clouds and safaris in decent shape are somewhat rare and quite desirable, especially to those who want to fix them up/restore.
you can check out david winick's website here vintage trailering
he's a few states over from you but relatively close in airstream terms. he's also a forum member. there are other forum members who do renovation that will hopefully chime in here for you.
look around the website here and ask lots of questions. there's a great community here and a ton of information.