Also...why did the console room that the Doctor's..."body"...look exactly the same as 11's console room...???
The same reason the Second Doctor and Jamie were in a "modern" console room in "The Two Doctors": because it's the set they had available. Designing and building a whole new "future" console room for one episode would've been too expensive.
Anyway, we know from "The Doctor's Wife" that the TARDIS archives old console rooms, so presumably every console room it's ever had is still in there somewhere. Maybe it chose this console room as the Doctor's tomb because it's the one that Clara knew.