I have a Logrite Mark 7 and an Arbor Trolley, a Simpson Capstan (chainsaw powerhead-powered), and strangely, I have a monster winch on my chip truck that I forget about, as it's not really been needed in forever, which would be useful for the arch.
Really leaning toward a Woodland Mills 130max mill. The wood coming out of my area is very nice timber. My friend's shop was built with Structural Select or whatever the top grade is, from a tree I took down about 14 years ago (big doug-fir next to primaries, etc...way more tree than I'd ever been personally responsible for dealing with at that point of climbing trees for a year or two). Only 1-3 months for delivery, supposedly.
I would like a megatrolley. Less work, size and weight than the arch for when I can lift the log with the mini or a winch.
Mind if I show my welder your work? Do you have a parts source you could please share?