Steve Williams over at Pigdog makes a mean mkI or mk1.5.... Or if you want to save a bunch of money, contact Andreas at Bad Pixel pedals & ask if he'll build you a mk1. Bad Pixel makes the best fuzz face on the planet imo.
I don't think a I.5 will do the Beatles thing all that well. Just about any other Tone Bender variant will do a better job. A Vox TB clone would probably get the job done in the most cost effective manner. Who is currently making good ones?