What woiuld be a ballpark figure for a 2ft x 6 ft x 3" thick plain hard maple bench top slab with no holes or cutouts?
Well
maybe a photo or 2 of the slab you are trying to envision would help. This is laminated hard heavy wood. The top is a combination of hickory, maple walnut oak and a few other hard wood types.
The bench in the photo is 3" thick. The length is 76 inches and it is 30 inches wide when the 18" slab and the 12" slab are pulled together and leveled. This bench when assembled is VERY heavy. What makes this special for me: it is the flattest I bench I have ever worked on and I have worked on a few.
To touch on Ken's question or comment I would add-- you don't want a solid bench top slab. It will not stay flat. The thing to keep in mind here is the slabs are wood that is "off cuts"
If you want a slab all hard maple 2' x 8' x3" you are talking about 48bf final.
If you want to see more bench photos, look in the Gallery under danmart77 workbench