There is a reasonable chance the mains will work on air given enough pressure and volume. I will try that first on bench test by hooking shop compressor to see how it works. After that if there are still problems maybe a jack screw solution can work. Bob Rullie had his main gears converted by Down and Locked and I think still uses air for the nose and brakes.
TBD.
I plan to take the F-105 to Super Jets South in Georgia next week for a static display and conversation piece if I can fit it in the camper somewhere. It will be after the SJS meet before any more work gets done.
Today I made a full size drawing for the pipe. I will send to Joey at J. E. T. Pipes in Ft Worth, Texas to make the 300N custom pipe. He made the one for my 1/5 F-16 and it works great.