Hi Jim,
the Drifter series houseboats are no longer built. They were made in TN by Houseboat Corp of America. This Co. eventually built Harbor Master Houseboats.

Drifters were built in the 70's. The hull material was steel. They were good river boats and utilized interior space well. Some of the later models had a design which was copied in fiberglass.

By now, the steel hulls might be thin and in need of repair. These boats can be restored and should give you comfortable cruising for years to come.