The German ADESS organisation has started building its new LMP3 prototype after confirming the first two orders for the car.
The build of the first Nissan-engined ADESS-03 is under way and testing is due to begin in September ahead of a possible first race outing for the car in the European Le Mans Series finale at Estoril in October.
ADESS AG boss Stephane Chosse told AUTOSPORT: "We have found our first two clients who we will announce at a later date.
"This has enabled us to begin building our design, and the plan is that we will start testing in mid-September.
"If everything goes well, we will try to race the car at Estoril, but we are under no pressure to do that."
ADESS has released computer-generated images of the car based on CAD drawings on confirmation of the programme.
The ADESS LMP3 project was originally a joint venture between the German motorsport engineering company, which designed the Lotus T128 LMP2, French composites group SORA and Sebastien Loeb Racing.
Chosse explained that ADESS was now working alone on the project.
The ADESS LMP3 was conceived around the monocoque of the SORA-built Pescarolo 02 prototype used at the Le Mans racing school, but Chosse said the amount of modifications required to adapt the chassis meant it made more sense to "start from a blank sheet of paper".
The Ligier JSP3 LMP3 contender built by Onroak Automotive is due to be unveiled at Le Mans on Thursday.