Building this D shape design in a 58" is something i've never done before Terry.... I've never had a request for one that short....62" is the shortest i've built to date.
But....... The riser length on the Flatliner and the Stealth designs are both 20" fade tip to fade tip on the 62" -66" length, then i extend the fades further with a power lam to get her bending where i want it.
In order to go down to 58" i would have to shorten the riser to 16"-18" to keep the limb dynamics the same..... So yes.... I suppose i could build one for you at 58".
The only thing that i forsee is the steeper angle belly ramps on the riser would alter the looks a bit. It would look more like the stealth design here than the Flatliner with the glass coming down to just above the Shelf.
Here are a bunch of build photos in this album for the "Stealth" design.
https://goo.gl/photos/gbVoVZEjRJ21q1uy7