I'm really happy with my Cambria 34 which was made by an instrument maker friend of mine from Markwood plans - available from Laurie & Glenn Hill of Mountain Glen Harps.http://members.aol.com/harpkits/cambria.htm
Markwood Heavenly Strings & Cases 809 W First Street Phoenix, Oregon; 97535 USA Phone: (541)535-7700 fax: (541)535-5657 E-mail us here: mwstrings@aol.com
You can get just the plans, or the plans & hardware, i.e. levers, bridge pins etc, or all of that plus a spruce soundboard, or kits in various stages of completion.
I'd highly recommend getting the strings they have for this plan because the harp is built specifically for the string gauges and composition and has a lovely sound. In fact the reason I chose that harp design was because of a series of articles I read in a Folk Harp Journal over 10 years ago, written by the harp designer, Mark Bolles, about the relationship between the strings and the harp's design.
The design of the harp itself makes it easier to make than some other harps I've seen because the soundbox is a simple right-angled box shape, no tapering, no curves.
Helen