Whoever drew that had a very poor sense of proportion. If the engines are in any way scaled to the size of the nacelles they would be HUGE; I don't know if 1940s tech could even build a jet engine that size. Feels like someone looked at a Gloster Meteor and drew the nacelles in proportion to the size of a B-17 wing, with interest. It's more likely they would have used the original engine mounting points, but even then a B-17 would need at least six contemporary jet engines and possibly even eight.
The rest of the aircraft is itself a very curious mishmash of B-17 C/D and F/G-era fuselages, and the tailplane is... odd. I can accept that they might have wanted to put extra vertical stabilizer area on, but that's usually done by leaving the horizontal stabilizers where they are and modifying them accordingly. Someone's tried too hard to kitbash a Lockheed airliner tri-tail onto a B-17.
I call not-real for all those reasons. It was quite probably drawn in good faith - someone somewhere got a whiff of "Proposed B-17 jet conversion" and let their inner twelve-year-old out to play, with the results we see here - but I don't think this is how Boeing would have done it.