I think the weight of the log should be within 85+- lb.
There is something about a woman forced to carry her cross, to struggle under the weight of a device which she will be crucified on, for sure. The struggle is part of the preparation, draining energy, sapping will, and of course hurting her dignity as she stumbles and lurches up the road. But this patibulum seems too big to me. Thicker than required for the job, not aesthetically pleasing, outsized in comparison to her female frame. And the weight? It depends entirely on what wood it is. If this piece came from one of my backyard trees it would weigh a lot more than 85 pounds!
Ultimately it's up to the artist. If this sort of beam pleases you, Esquier, then go for it!