Stirling ve-ingenieure

http://www.ve-ingenieure.de/stirlingshop.html Sells plans, kits for 500Watt engine. Provides CNC DxF files. The tubes at the top receives the heat and is filled with synthetic oil, providing heat to the hot part of the Stirling chamber. The design can be modded by placing the steel tubes inside a MoltenSalt boiler and running the oil through the boiler to the hot side of the Stirling engine. Embed the pipes inside a small billet filled with salt. A larger container filled and sealed with heated salt from a mini solar tower, Heliostat combination is fitted over the smaller billet, transferring heat to it.

http://www.ve-ingenieure.de/projekt_st05g_cnc_engl.html