Why no 'do-it-yourself' kits to make bino-scopes ?

I've purchased some binoculars recently, and it made me wonder why there aren't any kits marketed which could turn small refractors like the TV 76 into bino-scopes. Getting the EPs to line up with your eyes correctly would seem to be the biggest technical challenge. I like using a Binovue with my old TV 76, but it wouldn't have been all that much more expensive to have purchased a 2nd TV 76 instead of the Binovue if only I could hook them together and align them correctly.

if you look to the left you will find a little box that say's "about astro-mart", hit sponsors then hit bino scope company, instant parts though quite spendy. john