Hello - Checking my latest Hubbard catalog, which I collected at
the Boston Festival last year, they still show nothing directly
to the mid-size "Flemish Double"  kit offered by Zuckermann.
 
Hubbard and Broekman do offer a finished large "Flemish 17th
CEntury Double-Manual Harpsichord a' grand ravalement," which is
most directly comparable to the custom "large Flemish double,"
or ""Concert Double" harpsichord offered to experienced builders,
but not packaged as a kit.The prices seem to me roughly comparable
 
                                        David Calhoun, Seattle