I agree you should use 1/2" tubing and you really don't need the type L. You can straighten the coil tubing by raping it around a stationary object and then around a pulling object like a cable hoist and began stretching it. This will set the copper similar to a type L. A full 50' roll would stretch probably 6' Just cut off what you need plus a little more for waste and stretch it.. You could use trailer ball on a car and roll forward a foot or so on a short length and got out and look at it. I think the Ferrel fitting are the best but when you make them up you bottom the fitting out and then pull it back slightly before tightening it up leaving a little room for it to expand if needed. Once the tubing has been stretched it is easy to work with and if you don't have any benders go to Harbor Freight and pick up a cheap pair.
There may be guide marks on the bender that can be used for right and left hand bends for stretch and offsets, The best way for
bending is to make the bend with a little more tubing than you think you need and then measure and cut to fit.