Both that EV’s TL cabinets were designed in house by EV, based on the math and modeling by Thile and Small.
The driver’s performance was designed around the TS parameters (EVM series, post SRO) and then a series of cabinets (with a primary and a step-down tuning) were developed initially to sell drivers but were later used to design lines of cabinets in house.
Manufacturers were free to use EV’s designs with EV drivers, but later manufacturers designed their own cabinets around the TS math. Simultaneously, driver manufacturers began providing the TS parameters of their drivers, and with some serious slide rule work cabinet designs took a significant step forward.
There were no commercial cabinets designed by Thile and Small that I am aware of.