Yeah, walk away. If the boat
has major structural deformities you're not going to get a accurate or useful diagnosis on the internet
and coach roof are structural elements. Hard to tell from your description whether the post has been cut down or the roof has bowed up. There could very well be broken tabbing and who knows what else. In those older Irwins it's not unusual to have issues with the deck
going soft and the mast
sinking, and then owners making strange modifications in an attempt to fix it without really fixing it.