For the longest time, I have seen the BMS School Rocket advertisement in Sport Rocketry, I even used the paint scheme from the ad for my Madcow Torrent. I have been visiting their website for the last few days and noticed that they also have a 3.0" kit that they call 3" School Rocket. They have a version with a 24 mm MMT and another with a 29 mm. MMT. The webpage for the 29 mm kit lists several options such as a longer airframe and payload section.
They have a wide selection of parts that is Heaven for the scratch builder. It took me awhile to decode some of the part numbers but I think I understand most of it. There is a link on the Home page for TARC parts which brings you to a very useful pdf file.
I ordered the smaller kit and the 29 mm version of the 3" kit with the 34" airframe, payload section, rail buttons, pre drill rail button holes and 30" chute. The kit does not come with a chute. For only $65 you get a 57" tall 3" rocket. Check out
www.balsamachining.com