Cortland makes a "Competition Nymph Rod". I own a 10'-0", 3 wt. I bought it for the price alone. I'm not fussy about it's performance or quality although I'm a rod builder. I have seen rods in kit form from Hook and Hackle.

Best wishes

https://www.cortlandline.com/product...nymph-fly-rods

http://store.hookhack.com/HH-Xi-FLY-...products/1359/