I have to echo the comments above recommending caution. You will always find lots of things to fix on an old boat - nature of the beast. I found the ad for the boat you're looking at https://olympic.craigslist.org/boa/5154650613.html Even doing all the work yourself, you're going to spend at least 10K, probably more to bring it up to the level of a safe, comfortable cruiser. I would also question what the engine rebuild included - that doesn't really look like a fresh engine.
To contrast there is another on craigslist that is 10 years newer in Sequim asking just 8500 more than you're considering to offer that looks like it has been well cared for and maintained. It has an outboard instead of an Atomic but I think many would prefer that setup.
To contrast there is another on craigslist that is 10 years newer in Sequim asking just 8500 more than you're considering to offer that looks like it has been well cared for and maintained. It has an outboard instead of an Atomic but I think many would prefer that setup.