I have a bunch of aluminum tubing and fittings for sale. Tubing is annodized 1-1/4" nominal w/ 1-5/8" outer diameter, the same as NRS. Mostly pre-cut lengths ranging from 24" to 96". Fittings are all Hollaender 1-1/4", so for the same size pipe. Have a variety of Tees, 4-way crosses, 3-way and 4-way 90 degree elbows, and offset through-hole rail supports (think raft seats). Send me a message with what you need and I'll get you a price. I'm happy to build you a custom frame if you'd like as well. Located in Carbondale, CO.