I have never tried CF landing gear but over the years I have made my own aluminum gear many times. Having some experience years back as a licensed Aircraft Repairman where I found the aircraft industry favors 2024 aluminum sheet over 6061. 2024 alloy is harder, and has about a 17% higher yield and fatigue strength. Both alloys are workable and weigh almost the same.
I have bought 2024 from "On-Line Metals" in 12' x 12" and 12" x 24" sheets. From trial and error after using .063, .078 and .090 the .078 works best if the gear is in the area of 3/4" width. The .090 is ok for thinner 1/2" width and the .063 is just too light and tends to distort more than desired.
I have an old garage sale band saw I use for only for aluminum cutting with a medium coarse blade. After cutting I use a 1" thick Scotch Brite Finishing Wheel on my bench grinder and a small hand reamer to chamfer the drill holes. Following the wheel finishing to remove the cutting marks I polish the gear with either a fine 0000 steel wool or fine Scotch Brite pad. This produces a beautiful gear set with minimal work.
The 6061 sells for $26.09 for a 12" x 12" while the 2024 is $36.65. Either will work and you can easily make several gear sets for our size models from a 12 x 12.
Steve