Helikon Design Corporation
- Information about the round Helix Structure residential and commercial building design. Includes floor plans, photos, virtual tours, and price list.
- http://www.helikondesign.com/

Cavetown Planing Mill Co., Inc.
- Building quality custom woodwork for residential and commercial construction since 1881. Manufactures wall panels, roof trusses and floor trusses for panelized home construction and offers an ACE Home Center store.
- http://www.cavetown.com/