One more thing.....The tight/small volume of this rocket with the "robust" ejection charge from the D12, IMO, lends itself to high possibility of damage at ejection. To (try) and prevent this, I will make the shock cord much longer and attach the chute a little further down from the nose. If you use an AT RMS....dial back on the powder! I found the ejection from my D12-3 on my Geo-Sat launch (other thread) very violent/robust. Just my two cents...
Andrew