Given how big 1/32 Tomcats are, and the F-15 being a similar size, that ought to be plenty big. If mostly for the thought of just how huge a 1/24 F-15 would likely be o_O
Ok, looking it up, Wingspan is 42.8' (13m) and length 63.8' (19.44m), standing 18.5' (5.6m).
So, at 1/24, that would be 21.4" x 31.9" x 9.25" ("We're gonna need a bigger boat!")
At 1/32, 16.05" x 23.925" x 6.9375"--or so. And a Strike Eagle would be bigger still.
1/32 would be better for the ordnance and stores, like as not.
Would be a cool bird, though, once you figured out where to park it