Yeah, walk away. If the
boat has major structural deformities you're not going to get a accurate or useful diagnosis on the
internet.
The
deck 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.