Hollow Fingeboards?

After sharing ideas with a pro dulcimer builder, I am planning to begin hollowing out my dulcimer fingerboards. I never did it before but my own plan is to use the band saw to cut out the midle of the blank about 3/4 of the way down, leaving solid wood for working the strum hollow area. (Imagine a Tuning Fork shape) For the front end of the hollow I will make a block to enclose it against the tuning head. I will be laminating the top (as always) but using 1/4" hardwood (he suggested against very dense wood like Rosewood or ebony) which will enclose the fingerboard. It should be about half the weight of a solid one, I guess.

What methods do other makers use in making their fret boards hollow?