As far as I am aware, the Sprite was never aimed at the Military trainer market.
The design was commisioned by an early editor of Pilot magazine, to be produced as a homebuilt aircraft from plans and kits.
The design was all-metal in low-wing two-seat side-by-side configuration.
A number of homebuilt projects were started and a handful have flown.
The target engine was the Franklin Sport 4 (120 hp I think), but the two aircraft currently registered (G-BCVF and G-BCWH) have Continental engines (C-125 and O-240).
To build a Sprite today, the major obstacle would be lack of type support to answer your inevitable queries during the build.
The modern equivalent would be the the Vans RV series, which is a current design that could be built with full product support from the kit manufacturer.
Hope this helps
KZ8