Customer wants a 12' qtr sawn oak desktop. It'll have 42" of base cabs on either side with a 60" foot well. I'm looking at 5/4 milled to around 17/16 for the top. I can't get 12' boards where I live so am thinking of a running bond glueup using finished 8 and 4 footers, using biscuited butt joints for the end grain joinery. I don't have a table long enough to do this and am looking at my shop floor upon which to set my 3/4" Pony clamps. There's no way in heck that I'm going to end up with a perfectly flat 12' top, my hope is that I'll be able to pull it flat to the base cabinets with screws. I've got a 15" planer and am considering building it in 2 halves then doing a final glue up to get to the 25" finished width.
Anyone ever attempt a slab glueup of this size and have it come out reasonable flat? I'm paying $6.40 bf for the 5/4 qs oak and if I screw it up it comes out of my pocket.