We have an electric chainsaw at the space that’ll be some work to get through but with any chain saw your finished cut cookie will be far from
Level and most likely have high spots close to 2 in which none of our machine would be capable of flattening so you’d either have to use the cnc or build a router sled or omish style it close to flat with a hand saw and then run it through the sander, without the bark and once is thoughly dried, my recommendation would be carve crazy contours into it, very insanely pronounced random dips and valleys creating cool grain patterns to be exposed, leaving 4 little spots on the top level and get a piece of beveled glass and set it on top