Mike
It would hard to make a picture of the trailer right now, everything is covered for the winter. I will see what I have in the library. Design wise the trailer is standard. A reinforced "A" frame with a tongue. The tilt platform is an H with telescoping arms (so you can trailer the boat flat) with steel cradles for the hulls.The real difference is in construction. It was built like a commercial trailer. For a cat trailer it is a monster. It uses 2x6 for the lower frame, 2 1/4x2 1/4 & 2x2 for the upper and what looks like 3 in drill casing for an axel. Empty and bare it probably weighs around 1000 lbs
Your design uses the boat as the tilt platform. Steel trailers, hinges, etc damp road vibration and raise the resonance frequency. You are going to have to worry about resonance frequencies. If I don't tie my upper hull tight, it vibrates in the 0-10 hertz range.
I do not recommend launching a Tornado off a tilt trailer. It is hard enough keeping the corrosion off the expensive bits without dunking them in saltwater.
The US Tornado Assoc used to have plans for a good tilt trailer. Contact the US Sec to check.
The plans were detailed. They told you how long to cut what and how to weld, etc. Basically you could go to a self service steel yard and cut the parts. Then take them to a welding shop. Finally to galvanizer and then put it together.
When I first started, I wanted something like you are talking about. I was looking at a welded Aluminum or an aluminum upper with a steel lower. When I talked to trailer building professionals they talked about cracking problems with welded aluminum, transmission of vibration, galvanic corrosion at the hinge, and how the aero loads are dominant for the upper section. When I talked to an owner, he talked about sway, vibration and loosening hulls.
After living with the trailer for a while, I have decided that Isolating your boat from loads, stability in cross winds, ease of operation, reliability, and protecting that expensive hydraulic system is more important.
If I were going to build a trailer, I would look at the upside down system. A friend built one years ago. He claimed he might not be the fastest Tornado on the water but, he would be the fastest back on the trailer and he was.
