And, depending whose numbers you believe, they're either negligible or even NEGATIVE drag over bare side. (Sorta like how it's counterintuitive but the fatter "teardrop" Hindenburg and Graf II were noticeably lower-drag than the "tube" earlier Zeppelins.) There ain't a lot of room wasted inside, as I recall--I'm having trouble finding a ground-accessible and still ejection-friendly spot to place a footlocker-size computer core. (There are a lot of helpful diagrams re structures over at F-15E.info you might find worthy of perusal.) Plus, getting up to 1382... well, 1382 by itself is about Mach 1.9, which added to the base Eagle's speed would imply they thought this thing would outrun a Blackbird. (Trivial note, would you believe the REAL speed-limit on a Blackbird is the Exhaust Gas Temperature? If you go above EGT of 860F you melt the engine... so if the air's a little cooler at altitude, you can run the engine that much hotter and thus get a little more speed out of it--a Habu I once had the privilege of interviewing up here at the Museum of Flight told me that according to what Kelly Johnson himself told him once, if you could build an engine to get it there the airframe itself is good for up to Mach 7 or better)
I get that you're trying to build a faithful model from your inspiration, and applaud it--I'm just trying to work out how close a real Eagle can get to what they wrote... (Though this is one where I have the advantage as both builder and writer... While they pulled numbers out of their afterburner cans and went with Rule of Cool and leave you trying to build up to their spec, I have it easier starting with "how far could I realistically push an F-15, given a plane and access to all currently-existing technology?") for one, that's a whole new front-end, I'll bet the cockpit is a lot like Loral's old stealth-fighter concept (see the Monogram F-19) that requires the pilot to fly mostly lying on his back, feet forward. Definitely would have to have a Synthetic Vision System, as there's no over-the-side view, no view in the rear arc and limited forward visibility, I can't even figure out where the edges of the canopy glass are, or if there is any. If it's a single-seater, they might have been able to cram avionics from the #2 and #3 fuse sections into whatever of the former backseat isn't occupied by the pilot's top-half and open their former locations up into a new tank...
Anything I can do to help, just shoot me a PM and I'll see what I can do. :)