Easy Model Rocket engine insert and nose cone

Here is a design I sketched up for an Estes-style model rocket kit using a glue-in insert which acts as the engine holder and fin guide. I printed this in PAHT-CF and it's definitely strong and heat resistant. I'd recommend something slightly heat resistant (but even PLA would probably work too, just not last too long).

I used a laser cutter at my local makerspace to cut out the fins. Body tube is a BT-55 which can be bought online. You'll also want a parachute and elastic cording.
https://www.asp-rocketry.com/ecommerce/T-55-Body-Tube-30-Long-.cfm?item_id=567&parent=13&navPanel=1
https://www.asp-rocketry.com/ecommerce/12-Bulk-Sport-Chutes-Asst-Colors-12-Chutes.cfm?item_id=1078&parent=37&navPanel=1
https://www.asp-rocketry.com/ecommerce/1-8-Flat-Rubber-Elastic-5-Yards.cfm?item_id=1405&parent=146&navPanel=

Before assembly, you'll need to trim some support pieces from the engine insert. There are 3 support structures on top of the engine insert connected to the fin guides with some smal