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@Object
I been running a fixed mountain bike frame for some months too.
Mines a 135mm spaced rear mountain bike hub with two 1mm washers between the disk mounts on the hub and the ISO mounted cog and a 2mm spacer on the drive side of the BB (This is to allow clearance of the shimano cog which is mounted on the hope hub).
The saint Cranks naturally have a 50mm chainline which becomes 52 with the spacer on the BB shell.
Lots of measuring and trying differnet things has allowed me to get the chainline perfect.
Note that if you use a front hub (100mm) spaced out to 130, rather than a rear hub as I do, that your chainline is likely to be around 47mm when you add the 15mm spacer to each side of the axle.