Shell Valley Trunk Hinge/Bird cage support

[Three Peaks]

I'm just putting in the last pieces of my birdcage and wanted to line up my Shell Valley trunk hinge first so I wouldn't have to do this twice.
I got to wondering (always a dangerous thing) how I would weld the Shell Valley trunk hinge bracket to the 3/4" cross piece just ahead of the trunk lid opening.
This is what I've come up with- I am going to holesaw the side brackets to match the 3/4" hoop and remove the flat metal base. Then I'll weld the end brackets onto the hoop to hang down the same distance as if they were attached to the base support. This way I'll have a good body support at the deck lid and also have my hinges at the right location- I think.

Has anyone else tried this? How do I space the hinge so everything clears, especially the deck lid at the lip when I raise it? That seems to be the hardest part as I look at it.

Maybe I'm just worrying too much, but I just want to have this right before I weld it into place. I hate taking things apart and doing them over- not that I've ever had to do such a thing! - Bob

[Three Peaks]

Well, I figured it out. I actually drew some lines on paper to replicate the deck lid edge and cut out some craft paper shaped like the hinge and another piece like the deck lid. Took some tape and attached to lid/hinge in different ways and used a push pin as a pivot point.
Seems like the magic number is that the hinge pivot point needs to be 2 1/2" forward of the lip of the deck lid opening. This makes the deck lid clear before the swing of the hinge makes it contact the upper edge of the body.
Not only that, but by carefully cutting off the end brakets with the pivot pieces on them, I can weld them onto the bird cage support at a 30 degree angle so they will be pretty much hidden and they will work perfectly.

I love it when a plan comes together! -Bob