We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common ! Just start by posting a note introducing yourself to the group, that's all it takes here (we don't ask for or retain any personal information here, because our intention is to just "have fun and share information".
If you have the swim platform done then go with it, they're nice and everyone who has one seems to like them, but if you have not started that you might just leave it off. The boats look good without the appendage and they do tend to scoop water under some conditions depending on how close they are to the water and what model of boat they are attached to.
I saw the muffler, is that some sort of German marine installation? These boats do just fine with no muffler unless you have noise regulations, and even then they are not very loud without mufflers. The exhaust pipes on this model are exceptionally long and this tends to quiet things down.