You will be unlikely to find a planer and thicknesser that will go that wide. It would be possible to put it through a wide drum/belt sander but that would only make it a regular thickness, you really need to plane one side flat first.

Other option to get a flat side would be to fix it to a CNC router bed and skim over the top then flip it to do the otherside and finish with the above sander.

I did have a site somewhere that sold large slabs as tabletops and they used some form of overhead planer to get a flat surface, see if I can find it later. It was in Japan so a bit far to travel

Jason

I had a couple of ideas for the piece.

1) If I could find somewhere that had a bandsaw with enough height clearance, was maybe to saw the piece in half and reduce it's thickness and open it out like a book, ie 2 equal side that are a mirror image of each other (I'm not sure what the technical term for this is, although I'm sure there are numerous). Then, sand, polish and finish the pieces, move them apart and insert and fix a mirror to form a full length mirror.

2) An alternative was sommething like a dressing table top and use some other pieces of similar timber I have that are more managable to dimension to make a smaller mirror.

The wood has been felled for around 10years and has been kept dry since then, but without checking, I'm not sure of it's moisture content and it's possibility of further moving.

I'd never considered having it turned into veneer. Open question, how would I get this done and who would I sell it to? Why would anyone buy mine rather than go to a stockist?