$15 million might get you the avionics out of that F-15
Here is a pic of what used to be my trainer

This plane is 10 years old, taught me, my father and this summer my lil brother how to fly... constantly updated and flying great!! Started out as a Royal Air 20T ARF, now with a zero dihedral wing that is 6" shorter, larger rudder, better landing gear, larger ailerons with an HS-81MG under each wing and an OS .35 on a tuned pipe give this "trainer" some attitude

ROFL It will hover at full throttle and I have a scratch built fully symetrical wing for it too that makes it a real blast. We built a removeable "cradle" for the wing saddle that allows use of the fully symetrical or flat bottom wing as easy as removing the rubber bands and removing or installing the cradle and the wing of your choice

We run it with an 11x4 Zinger to keep the flutter away and have some good vert.
Brian