Several companies were formed to help builders complete their kits, and many of the aftermarket modifications were worked into these services. , BD-Micro Technologies of Siletz, Oregon continues to offer kit building support, including new-build kits featuring (optionally) all of these modifications and powered by a Rotax 582 or Hirth 2706 two-stroke engine, and even the BD-5T, a turboprop version using a TRS-18 turbine powering a mechanically-controlled variable-pitch propeller. Alturair, Inc. of San Diego, California also offers extensive parts and construction assistance services, as well as kits for the BD-5B and BD-5G models.