I have finally moved things around the garage so that my SO can use half or it, and I can use another half of it. The Clausing is now set up in a very convenient (for access) location.
I want to set up and level my lathe now, to try to measure its cutting accuracy more properly. To that end, it would be a lot easier to set it and level on three 4x4s under it (two on ends and one in the middle) and level with wood shims.
Doing so would be very easy and allow its future more with a pallet jack.
If it would lead to proper leveling and proper measurement, in the short run, but would go out of level in the "long run", that's OK with me as for now I just want to assess it better. If the lathe needs rework, I would disassemble it to take the bed for grinding. If, after leveling, it produces acceptable to me results, then I can set it on a concrete floor to run forever.
Anyway, the question is, would setting it and leveling (with shims and machinist level) be sufficient to get a accurate answer about its wear and to quantify its ability to make straight cuts.
The lathe in question is Clausing 13x36, with a solid base that runs full length of the machine.