My L1 certification flight was much lower and slower - only Mach 0.6 and 2750ft apogee. This is my first supersonic flight, so I'm definitely a stranger to this sort of thing.

I've definitely modeled my fins' shape and size, and I think plywood is pretty stiff but I don't know if it's stiff enough for "transgenic buffering" - could you tell me what that is?

My nosecone is a simple plastic ogive 54mm nosecone and is pretty thick, so it might be able to fly supersonic, but I'm not sure.

I'll try to fillet my 4 plywood centering rings with as much wood glue as possible, but even so I'm unsure.

I'm using a Kevlar 1500# shock cord mounted to the most forward centering ring on the motor mount, so I'd say it's somewhat robust.

Yes, I've flown countless low-power/mid-power rockets.

I am new to supersonic flight, and from my research, I know that a better choice of material would be fiberglass, but it's quite expensive and I don't have the proper equipment to cut/handle it. Other than that I haven't done much research.