I think you are going to have a little trouble getting a cross steering setup in there. First of all you are right, that is a model a frame. One problem is that they are very weak in stock form, and even when boxed can flex a little when you put a steering box in there that wants to push and pull the frame sideways when you turn the wheel.

Second problem I see is that it looks like you want to run the front end suicide style. What is going to be the issue here is that the spring is going to want to occupy the same space as the draglink and tie rod. If you were not running it suicide, but with the spring directly over the axle, you would have a shot at it.

In either case, you are going to have to run a panhard bar to keep the front axle from shifting on the spring shackles when you turn the wheel. I think you are making a lot of headaches for yourself engineeringwise. A simple box like a 50's F100 or a reversed Corvair would be so much easier to make work IMO.

But that is just my thoughts on it and I could be way off base.

Don