Well, the swim platform is off the shelf, nothing custom or fancy about it, except ordering the platform separate from the stairs so I could get the 3-step stairs that store nicely. Will be nice for getting in/out of the dinghy. But honestly I could have had one fabbed from aluminum that would have been really cool, but the cost and weight start to add up. With a little bit of work, I bet you could glass one up and make it functional and light and look super cool.
The trim tab manufacturers want you to get a much larger tab than you need. Our boats have less deadrise than many boats, and weight a LOT less, so we don't really need what they specify. Also, keep in mind that their sizing is based on being able to trim the nose of the boat down, which is not what the GA needs, at least in my case - I only need to trim to keep from listing. I think 9x18 is perfect. It sure works well at least. Plus, there is not enough room for a 24" tab and a transducer, so keep that in mind!