Another view of a single, untriangulated upper arm, IRS design, showing the massive lower control arm necessary. Notice the wide design, the reinforcements, and how the axle centerline is close to the outer spindle attaching points. All missing from the OP design.
All to handle the massive power of a t-bird.
Chroming it or using rod ends is just putting lipstick on a pig
A ground up design should be based on the best handling performance vehicles around, not a design for a relatively low power car in which comfortable ride was probably at the top of the wish list.