That must have been some might sharp sand lol. That or it sat for a good long while before it got pulled off.
On the bow shot, the crack above the obvious damage would indicate a structural failure in the hull
glass. That is NOT from hitting some sand. All that is going to have to be ground back to good glass, up farther than you think. Not an insignificant repair.
Looks to me like the rudder
damage at the top is from the chain.
I would inspect the rudder post, sleeve, bearings, steering
etc. VERY carefully. That is what I would be most concerned about. From the hull
and rudder bottom damage either it was grounded on something harder than sand or it was aground for an extended period. Either one is going to put lateral stress on the rudder system in a way that it was not designed for, to say the least.
One word of caution; if it is sold
as is, you can get a good estimate of repair and negotiate with that. I would NOT under any circumstances buy the boat
if the current
owner is going to repair it first. That's a recipe for a poor repair as the owner is obviously incented to have it done as cheaply as possible.