DIY Sunfish trailer

Thought I'd post some pictures of my trailer and thoughts on it. I'm looking at building a dolly, and browsing through pictures and descriptions of what other people have done is very helpful, so I want to share some of my "build your trailer" experience. Never drew any plans for this, so I don't have them, or a specific bill of materials, just looking to share ideas in the hope that someone can make use of them.

Main trailer frame is a very ratty jet ski/small boat trailer that...
...