The PERFECT stubby nosecone!
I found these at the local hobbyshop today...
http://www.ehobbies.com/1004-4919.html
I got a 3" and two 2-3'4" spinners and combined
with a 3" to 2" and two 2" pvc pipe joints they are
nearly perfect nosecones! The only work they need
is to fill in the holes for the propellers...very minor.
Hope this helps!