It doesn't sound very hard, since the individual needle spikes can just be one piece per spike. Also the body's just curved. Maybe ask one of the Pep Pros.
Isn't there a pep request thread hiding somewhere?
There used to be one on here, did you try searchin for it? Or go into the halo wiki pep stuff. theres a TON of weapons on there, the needler might be in it.
did you check the wiki? i think there is 1 on their.also just pep the spikes from the spike grenade. nvm their isnt a needler on the wiki but their is a spike grenade so just pep the spikes from it and try and finda needler model or some references.
purple LEDS would do it youd probably need about 8 of them. i saw the most B.A. in game needler ever though. it has blue spikes instead of purple and is a light blue color. also it had a custom reload aniamtion where you flipped open the top of it and loaded it with those little needler magazines. il try and get a video of it.