So, is the engine a PT6 variant? It's the only production engine I know of with the reverse flow to yield front exhausts. That would be in keeping with what the airframe is stressed for rather than some over-powering engine. You could probably locally modify the steel-tube fusealge to allow for fitting an ejection seat, so I'd not worry on that account. Tip tanks (perhaps from Cavalier's Mustang conversions) with underwing rockets and rocket pods sound good, though I think I'd also want at least one gun pod under each wing for when I want to get a bit more "personal".