Have you ever done a twin engine bird? It would add a little weight and complexity, but you need a little more challenge with your skill level!

The Avro reminds me of an F-5 Vigilante. I don't know why...maybe because of the single vertical stab when everything these days has two. The F-5 already has quite a bit of wing area, especially the reconnaissance version, so you wouldn't have to enlarge it too much to get a usable glide. It's not a delta, though.

Aviation buffs can tell me for sure, but I think the Vigilante had the first flying vertical stab (all moving like horizontal stabs that were already in use). I'm sure it used the same J-79's as the F-4 because those were the beasts of the late 50's and the Vigilante was a pretty good size plane.

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I love sanding.