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Yep. A bit of the DT material with the front cut off, and then opened up to 31.7mm (I'm assuming you're going for a 1" fork) would do nicely I would've thought.
I agree with tester about the TT though - I can't see stiffness being and issue, and given that vertical stiffness is guaranteed from the tube shapes, I would've thought a flat oval TT, with the thick plane being horizontal, would be best.
P.S. Also agree with tester about the external headset cups - the thinner HT is a worthwhile trade-off.
In which case, some sort of webbing between the TT and DT would be optimal...