I would have thought the root wood would be more stable, be less resistant to splitting, compared to straight grained or normal lumber.
I'll make the leg units almost complete, attach temporary trestles (stained pine?), rather than use the finished walnut trestles. I'll use the table , as is, for several years (until the legs dry), then complete the project. It should still look decent, half done, this way.
I have one slab hand planed to almost flat.... that was tough work. I sti ll need to do some chainsaw trimming on the other slab, before any hand pla ning on it.
The table top boards have air dried for almost 2 years, so I'm confident I can finish these. I've done lots of hand planing on them, but will likely have the local woodworks pro shop do a finish-planing on them. They charg e $3 per minute for planing. Later, I may get an estimate for wide belt s anding of the leg units, also.