Mark,
There is a bombe desk that John Cogswell made for Thomas Armory, Jr. (see attached photos) that is similar to the Gardiner Greene bombe. It is 1-1/4" wider than the chest but shallower by 1-1/16". The height of the chest is 31-7/8" and the desk is 42-3/4". Based on this quick evaluation, it would seem that the plans could be adapted for your purpose. If you'd like to kick it around, contact me off forum. BTW - Thanks to you and Margaret for your work on getting the newsletter out.
Craig