KDP/Createspace [1] make it really easy to self-publish on Amazon. There really is no reason not to have ebooks at launch these days. Especially if you're self-publishing. There are plenty of apps that help (had to research this personally recently):

[1] https://kdp.amazon.com/

http://www.booktango.com/

http://www.bookbaby.com/

http://vook.com/

http://pressbooks.com/

It's probably not trivial to make an ebook for a book as graphic and layout intensive as this one.

He doesn't appear to be interested in working with a publisher either.

So it's either him or no one. I know I'd rather spend my time writing books, not formatting ebooks.

He's never done ebooks, it's sorely lacking IMHO for this kind of book. I'd buy one of everything as ebooks.

Not entirely true. I have the first edition of this as an eBook.