I invite you to argue that way against Sony among others, who have taken works out of copyright and republished them in alternate forms establishing their own copyright. They argue that converting the work to the new format meets the transformation standard set by existing law.
Somehow I don't think Walter will go out and sue people if they make copies of this e-book but I do expect that should he do so he would prevail.
So off list one of the Gutenberg folks pointed out this exception:
"Chuck they get away with this by adding a new introduction or critical essay to be book, delete that and its back to public domain."
And notes that every republished work by various publishers that use public domain material does add an introduction or a bit about the author to establish that Copyright.
So I take it all back, Walter you should introduce your book with your thoughts on how appropriate it is and then charge what ever you want :-)