spd exhaust stocks a ton of different radius/OD/wallthickness combinations will have everything you might need and more......... .049" isnt really that thin, just need to learn some finesse there buddy (area1320)
Also if you go to woolf aircrafts webpage, go to there surplus bend section and you'll find VERY cheap bends there in very thin thicknesses. Ive got some thin .030" tubing from there before as well used some large 4" tube on a 4" bend radius before. Very nice guys there and very helpful. Plus they carry the exotic stuff which I like.