Well, I decided to build a micro today, (will post pics later) and found a great source of nose cones for minimum dimeter micro rockets; go to Michael's or Hobby Lobby, find the plastic models, look for the Revell 1/100th snap together F4 Fantom, CA the two halves of the fuel tanks together, cut the ends off with a hacksaw, glue on a shoulder, and voila! A 7mm plastic ogive nose cone! From the three fuel tanks, it you sand off the tabs to attach them to the model, you can get 6 cones, for about $4 with a coupon.
Just thought I'd share this with you guys. Pics of the rocket (Actually, the second rocket. Pics of the first one will be uploaded to the "Paint Failures" gallery. ) are coming