If it's not too rocky or root filled, I'd get a trencher and lay it out to both ends, then have inspector check final connections.
Anytime I had him come, he would inspect one or two of the dozen boxes, and sign it off. I was always fussy anyway, with all romex laid flat and secure. This is extra work, but looks killer in exposed pole barn.
You might as well go 100 amp or more with small panel. Going from 50 to 100 amp isn't going to be that much extra.
For all the 110 service/
I ran all 4 plex outlets.
Each pair of outlets in the 4 plex had dedicated 20 amp service, vs the 4 plex on one 20 amp circuit.
Now general purpose 1 hp air-compressor can be on one side, and any other tool on the other half of 4 plex. Even 1 hp pressure washer.
This saves running cords across area to get a clean 20 amp service to the tool.
The rule then at the panel box, is to gang both 20 amp breakers together with bolt going through the hole in the end of switch triggers.
They will be mounted in the panel above each other.
This way if one is inside the 4 plex, both circuits are switched off, and harmless. A lot of 12 and 10 gauge, with only 14 going to lights from the switch.
If outlet is a single pair, then I split the upper from the lower on separate runs. This has ended any blown circuits for years.
2 welding 220 outlets should be in opposite locations near the main doors.
With one, the project always ends up in the other bay.
I made up a fifty foot 220 extension cord for 50 amp wire feed welder.
Just in case the project won't fit inside. I prefer to do all of it outdoors with the grinding mess getting into everything and the bad resin taste.