I own siskin #77.
You are not going to win any races but you'll get where you want to go. Probably not in time but you'll spend more time on the water in reliable and predictable environment.
Doing them up can be quite a task with replacing the interior lining as an especially daunting task.
I love this little boat. Mine is not for sale anytime soon.
There are several coromandel restoration blogs online that provide good insite.