>>2950082
Diagonal braces do surprisingly little. First of all, the base isn't perfectly rigid and, unless ridiculously overbuilt, twists under its own load by about the same amount. Second, by the time the gantry legs are beefy enough to not twist into a pretzel (a major weak point in many designs), they're also beefy enough to transfer the forces into the base without much need for additional bracing. For pic related the difference is less than 7% which is not worth the trouble imo.