It would make a great L-1 AND L-2 kit.
I fly mine on J-350's no problem stock build. Goes 5-5500 ft on one.
By simply using the coupler as a av-bay and holding it in the payload section with plastic rivets you are good to go. You will have to buy 2sets of coupler bulkplates for each end of the av-bay. [converted coupler] Some eyebolts and threaded rod for the altimeter sled.
Use tubular nylon as shock cord and a 48- 60 chute for the main that will handle up to 6-9lbs weight. I fly drogueless but if need be a 15-18in. drogue should suffice. I prefer a streamer for tracking. [easier to see] 4in by 72in streamer. Topflite for both solves packing problems.
25ft of shockcord 9/16 on each end and start with 1.5 grams of bp for ejection charge. [ground test to dial in]
2 shear pins [2-256 nylon screws] in the nose. Railbuttons and 3 5/32 vent hole for a 6in coupler/av-bay. Your in.
Add 1 1/8 vent in fincan and another 1/8 vent in the payload.
Don't have any pics of mine as the rocket gods ate it last year after many years of service.
A single wrap or two of 6oz glass will go along way to keeping it from damage, but is not a necessity. Even then the fins don't need any, they are plenty strong as is. The glass will keep you from more travel damage than anything.
Just keep reading build threads on the forum and it will get you there. But I would write down the above information. It's proven and it works!
Here is a link to a complex build I did on another 3in rocket you can get lots of ideas from. Page 4 starts the av- bay, just downsize the rods if need be but the theory is the same. Good luck.
https://www.rocketryplanet.com/forums/showthread.php?t=2648
It's a long read but contains everything from building..... to rules of thumb for paint colors.... and how to paint and make your own decals and place them.